Algebra: Solving Linear Equations - Part 2: Applications

[ahmedelkahef]

okey, i think that will help. thanks

[ahmedelkahef]

the word proplems are too hard to solve,i don't know what to do.

[videomathtutor]

@ahmedelkahef If you are having a hard time with the word problems in this video, you may need to first watch and study the "Basic Math" videos I have here. Also watch the algebra videos that were made before this one (use playlist to see). Downloading the printable math notes will be helpful too. Some are free, others you would need to pay for (or get the DVD to get both full video lessons and notes).

[XSuperFistX]

solving these are easy, but don't know why my teacher didn't teach me this

[oconnor333]

@groundzerobuild he is not disrespectin your religion in this case he knows alot more about math than you and it does not matter who the heck discovered what the arabs discoverd stuff and so did everone else but no1 cares about who discoverd it

[coachey01]

How much is the full version?

[videomathtutor]

@coachey01 It depends. You can rent it, download movie, just get the PDF notes, or buy the DVD (which includes the PDF notes and movies in different formats). All these details are at my website. If you need more help, just send me an email message.

[adfroman23]

good help. I skipped COD for this :)

[sman261979]

How do we know that A - 2L = 2W is being multiplied so we know to divide. Is that like the second rule after the subtraction?

[videomathtutor]

@sman261979 I explain that in Part 1 of this lesson.

[dewinds1998]

how to take the m=0 by trying to take the defective numbers

[videomathtutor]

@dewinds1998 I have no idea what you are trying to say.

[Forestmountains1]

Thanks for the videos; there going to help. According to my test scores, its prerequisite to pursue basic algebra before moving on to intermediate. The Basics has been pretty easy as for now.

[B070D99]

thank you very much sir!

[groundzerobuild]

Why nobody is teaching Islamic maths?~ In fact all mathematical theory was indeed discovered by Arab Scholars!

[videomathtutor]

@groundzerobuild I think the Ancient Hindi, Chinese, Egyptians, Greeks, Mayans, Babylonians, and others would disagree with you. There is no such thing as "Islamic" math. Islam is a religion. Ancient Arabs did make huge contributions to mathematics, and that *IS* being taught in classrooms all over the world. Visit your local library to read all about it!

[groundzerobuild]

@videomathtutor I respect you but you undermine the Islamic scholars work and contribution to the world in general will surely will put you in a dangerous position.You seems to to have a typical ego centric attitudes towards Islamic achievements!~you should know that all numeric numbers that you use are indeed belongs to the Muslims?

[videomathtutor]

@groundzerobuild You REALLY need to read up on your history before typing anything. It shows your ignorance. Arab contributions to mathematics PRE-DATES the creation of Islam by CENTURIES. I am not in a dangerous position, since I have not done anything to offend Islam. It has nothing to do with my "ego." The Hindu-Arabic Numerals don't "belong" to Muslims. Ancient Arabs (not Muslims, since there were no Muslims at the time) got the Numerals from the Hindus.

[huZky18]

@groundzerobuild lol nice fail

[bachgod]

Congratulation you are wonderful. In previous videos You sayd that you are not teacher that you are a tutor. I think you are a natural teacher and you have what a lot teachers haven't creativity and sense of humor. 100 % for all what you teach us, keep going...GOD bless you. Oh Me gusto la enchilada que se comio en unos de los videos.

[TheQa1207]

interesting videos..

[thinkingization]

These videos of yours have been very helpful! Thank You and please continue to teach us...

[Thenerdynerd1]

Wow wen I watched this it helped me so much I was at a C- In algebra but then now I understand the true meaning of math so I have an A+ u can tell I'm a nerd well at least my friends call me one anyway even nerds get bad grades once in a while don't u think?

[ilyxb00]

I'm such a nerd. For looking this up.

[wearescrewed08]

This was helpful.

[gmsherry1953]

I'm not going to watch this all, but in the first example, by common sense, l = length and w = width (after all, you said it was a formula, not MERELY an equation, which invites us to make the letters "stand for something") in which case your formula gives the perimeter. So why choose A for the other variable, which suggests area? Also, with all the ways you fiddled with the answer, why avoid the most obvious, cross out the remaining 2's and make it A/2 - l? I mean, it's RIGHT, but gee!

[videomathtutor]

@gmsherry1953 I did not state the formula was for perimeter of a rectangle. It is just a generic formula. You should NEVER assume a formula (or variables) stands for anything other than what it is stated. There are MANY ways to state the final answer, I was not avoiding anything. Your answer is OK. It has 2 terms, and usually, one tries to get a single term answer, when possible. By the way, what may be "obvious" to you may not be for someone else.

[gralvien]

@videomathtutor Well said =)

[qwertyfshag]

thanks for the help. i have to take finite math for university. this helps

[daryllclarin]

nothing...

just asking

[daryllclarin]

are you an american?

[videomathtutor]

@daryllclarin Yes. Why is that relevant?

[christianz2010]

@daryllclarin what other people have an accent like that?

[videomathtutor]

@christianz2010 Everyone has an accent.

[daryllclarin]

VideoMathTutor....

How to solve linear equation with two variables

[videomathtutor]

@daryllclarin That is another lesson I will be making later.

[AllyKat0143]

so would you leave the answer at 3.12 barred is equal to 103 over 33 or would you continue to reduce the improper fraction?

[videomathtutor]

@AllyKat0143 It does not reduce. If it did, you should do so.

[Shiiransama]

Are there more algebra videos to come? How long does it take you to do a video?

[videomathtutor]

@Shiiransama Yes, more videos are on the way. It can take a me a long time to make a video, since I do it all (write, star, direct, edit, graphic designer, produce, market, etc.).

I do hope to get things done in a faster way.

[Sbug90]

Hi videomathtutor I love your videos I am brushing up on my algebra before I take my placement test to start college next week. I didn't quite get how to convert the decimals into fractions. You say to use 10 to the first 10 to the second 10 to the 3rd and so on to determine how many decimals to move over..I don't quite get that part perhaps I'm a little dumb haha which is quite possible i suck at math..anywho I have understood everything else really well thank you for the help!

[FavoriteBandBlog]

wow ur no help i dont get it..

[VassualtV]

I think this is what MonsterNBed ment:

@corrected@

Erm, that is wrong because when you divide both side's you can divide that by (2L) ...and don't have

to have it as a fraction. The answer would be (A/2-L=w)

[videomathtutor]

Your correction needs correcting ;-)

[MonsterNBed]

um that is wronq becus wen yu divide boths side yu can divide that 2l ...and not have it as a fraction. the answer wud be A/2-L=w

[videomathtutor]

It is not wrong.

What you say (in VERY bad English!) is also correct. What I tried to do was create ONE term. You solution has 2 (and there is nothing wrong with this). I also stress in the video that there is more than one solution.

[musicatings]

this is helpfull

[alcolo176]

thanks this is so helpful!!!!!

[MamaBarb03]

i love algebra! im in honors algebra right now and you helped make my A an A plus! ty!!!!!

[spongykyk]

thnx u just saved me from getting a D in algebra

[videomathtutor]

Glad I could help!

[homeboy71991]

see thats what i never got in algebra for example #1 y did u decide to subtract 2w, y not 2l?

[videomathtutor]

Ummm... I did subtract 2L. You may want to watch "Introduction to Algebra" before watching this video.

[twistblabla]

hey thankyousomuch i have an entrance exam in IGCES tommorrow, this will help... :) thankyou!!!!!

[cmilerx001]

THANKS BRO

[TheRappyTappy]

You are correct, I was changing the fraction to a decimal and then computing. Just keeping 5/9 as fraction, completing the parenthesis and then multiplying and reducing, it comes out correct. Thanks again! : )

[TheRappyTappy]

Thanks for the vids :) Knowledge is power.

[TheRappyTappy]

On example #3

5(F-32)/9=C is more elegant and precise to me. Plugging in a random number such as C=2 gives you the answer F=35.6. Plugging in the number found for F in my answer gives you exactly C=2. With answer shown in the video, making 5/9 a decimal and using the same variables C=2 and F=35.6 when plugging does not compute back exactly 2.

[videomathtutor]

Well, obviously you won't get back the same answer if you make 5/9 into an APPROXIMATE decimal. Keeping it a fraction will yield the same answer.

[Afrocanook]

At 02:48, I believe there should be brackets around the "A-2l" to indicate that this portion of the equaton must be solved first.

[videomathtutor]

Huh? No brackets are needed. First off, the formula is already solved. Second, the fraction bar takes the place of any grouping symbol.

[Afrocanook]

My previous statement was made in anticipation that at a future time if the numerical values for "A" and "l" are given then it will be known that the substraction in the numerator should occur first. That is all.

[videomathtutor]

O... K...

Well, you can "work backwards" and start with the formula we ended up with, then solve for A or the lower case L. In any event, brackets (or parentheses) would not be needed, at first, since the fraction bar groups them. If you were then to multiply both sides by something, THEN you can enclose the numerator with the brackets or parentheses.

[max1916251080]

well if it was 13.333.. then it would just be 3/9. and 9*13. so 120/99 or 40/3. That's just basic math.

[imtolazytothinkofone]

very useful, thank you

[chemistrycoolguyscom]

what level is thi video what grade and level? in your videos how many grades do you include ?

[videomathtutor]

There is no specific grade level for my videos since different schools do math at different paces. This is a beginning algebra video for those just starting out.

[max1916251080]

there is a much easyer way to do the .333.. thing into a fraction or any repeting decimal. just take what's repeting (3 in this case) and make the denominator a 9 for each digit u have, so one 9 here. 3/9 or 1/3.

ex: .147147147147...

147/999 ( and then u can use your wonderful ti-83 to reduce) 49/333

ex: .23232323...

23/99

[videomathtutor]

Well, the way I show it works for ALL cases. For example, what if there is a whole number in front? Ex: 13.555555... or how about something like: 0.022222222...?

[chemistrycoolguyscom]

logarithms are even harder and trigonometry functions.

[videomathtutor]

Logs are easy. Most teachers make them hard to learn. Trig is a bit tougher, but not THAT bad. I hope to eventually have videos in these areas.

[max1916251080]

Yah, if it was 13.555... it would be 122/9. That's is just basic math. And for .02222 you can just use your Ti-83:P so its 1/45. So you do have a point there but mine is if the number is sumthing you can use what i did with. Its much easyer and faster. So just chill!:)

[videomathtutor]

The whole point is to learn a technique that works for ALL cases BY HAND (no calculator).

[Magnum934]

Why are my parents paying for an education for me when i could be homeschooled and learn the math from you, Anyone mind telling me how i can go about getting homeschooled?

[videomathtutor]

Keep going to school. Not all parents are qualified to homeschool. I am a SUPPLEMENT, not a replacement of your math teacher. Besides, if I were your "teacher," your parents would still have to dish out cash. Not all my videos are free. They would need to do webcam tutoring with me. They are welcome to contact me if they are interested in this.

[UsmanDM786]

which class is this for?

[videomathtutor]

It is not for any specific class. It is a general Algebra lesson to help you with solving linear word problems. This is usually covered in Algebra 1 or the beginning of a college algebra class.

[sk8boardgeek596]

no life

[videomathtutor]

Thanks for sharing with me about what is happening with you. I'm sorry to hear you have no life. Maybe if you study more math, get good grades, graduate, and then get a good job, you will THEN have a great life! I will keep making videos for you so you can achieve this goal.

[sk8boardgeek596]

i meant u have no life.

if that is all u do everyday every second of ur life then u seriously have no life.

BECOME A TEACHER AT A SCHOOL!

and if u r a teacher then good for u.

[videomathtutor]

I know what you meant. I was trying to be funny.

Actually, I think I can do more good by being a math tutor and running my math websites than by being a teacher. A teacher can help a classroom of students. I help thousands of not only students, but also teachers, tutors, and parents of home school kids. Oh, I also do quite a bit in my life than just tutor. This is a job for me. I have a personal life too, which is amazing for a nerd such as myself.

[apbmusica2007]

Goodness! u r very good, and very explicit, Wish I have seen this b4, Now.. I am relieved to see u @ work Sr.

Thanks!

[videomathtutor]

Please don't tell people I am explicit in my videos. I might get in trouble... heh, heh, heh...

[killerkitty777]

HEY! I recognize the formula he used in example 3!!

C = 5/9 (F-32) is the formula for how you convert degrees Farenheit to degrees Celsius.

Of course

F = 9/5 C + 32 is Celsius to Farenheit

sweet!!!!!!!!!!!

[TheHaloCEVideos]

Keep making more videos please...

I really thank you for your algebra videos.

[ailsa166]

Thank you so much. I think I re-learned more in 20 mins than the 4 weeks slogging through algebra. No easy feat for my 39 year old brain.

[MelodyNEsther]

how could a vid be so long?

[videomathtutor]

I have a special status on YouTube: "Guru." I am also a "director" so this allows me to upload longer videos.

[badaudio]

mang this stuff is hard. imma keep tryin tho.

[KodeLiMe]

You are simply awesome.