A17.4 Solving a System of Equations by Substitution

From http://www.squidoo.com/systemsofequations this is an example problem on how to solve system of equations using substitution. See more examples at http://teachingandlearningmath.blogspot.com/

Category:

Education

Tags:

• Math
• Algebra
• Solving
• Systems
• of
• Equations
• by
• Substitution
• Help
• Tutoring

[jacobflevi]

This Video was VERY helpful to me I was lost and it was able to help me finish the work that i needed to finish. thanks.

[ttor68]

I am glad it helped...I have others over similar topics(note that I refer to the addition/subtraction/linear combination method as elimination).

[InsideOhio]

So much better than my Algebra teacher. Thanks! <3

[Shadowknight805]

You are a life saver. I need to boost my Algebra grade like no tomorrow and my test is Tuesday. Arigato!!!!

[orangegreendaysuite]

@wizman246237 this may be late, but I'll try to explain anyway.

When he simplifies the second equation, the negative carries when he multiplies it out. When you are subtracting, you're essentially adding a negative which is why he puts a + after 3x. Sorry. That was a bad explanation. D;

Oh and ttor68, great videos you have! Makes studying for my midterm much easier. ^^

[Zovam]

Thank you this helped me.

[wizman246237]

why does he add a + after 3x when there isn't a + anywhere in the 2ND equation? How do you know when to do this?

[juniorfromcali92]

thank u u made me ace my test thumbs up!!!

[mugalagabushca]

hey man this is so much helpful, thank you very very very very much

[SupportAdamLambert]

wow this really helped thankss :]

[Ulqui009]

Thank you so much!!!

God Bless you!!! You made me learn!!

I can't believe it was so easy and i was stupid not to get it! D: Thank you! You saved my grade from getting an F in a test lol :D i passed!

[IcEmaNh3rO]

Dude thanks man you saved me.