cramer's rule, 3x3 linear system

How to solve a 3x3 system of linear equations using cramer's rule. Made with a Logitech Webcam on a Sunpak 1818XL tripod

Category:

Education

Tags:

• algebra
• determinants
• cramer's
• rule
• Logitech
• Webcam
• Sunpak
• 1818XL
• tripod

[clrc333]

isnt d -14 please comment i have test tomorow and dont see how i got d wrong -19 +5= -14

[robichaudd]

@clrc333 Here's how to get D for the 3x3 Cramer's Rule video. The same process can be used for Dx, Dy, and Dz.

For D, expanding around the top row of 1,1,1 we get

1(-16-3)-1(4-1)+1(3-(-4))

1(-19)-1(3)+1(7)

-19-3+7

-15

Hope that helps :-)

[clrc333]

@robichaudd

thanks i got 100 on the test!

[robichaudd]

@clrc333 awesome, way to go!

[robichaudd]

Here's how to get D for the 3x3 Cramer's Rule video. The same process can be used for Dx, Dy, and Dz.

For D, expanding around the top row of 1,1,1 we get

1(-16-3)-1(4-1)+1(3-(-4))

1(-19)-1(3)+1(7)

-19-3+7

-15

Hope that helps :-)

[XSweetXAngelXAnimeX]

hold on how do you got -15,-30,120,-15???

[680540]

I think Dx is 5 not -30.

[jazzyjimmy83]

@clrc333 haha tomorrow is mine

[Mik3y243]

Thanks A lot!



[dancevuna]

Oh I love youtube for things like this. You are not an angry Russian lady yelling at me and I got it and still feel smart, whereas when she is trying to say things I feel like a 1st grade kid all over... not fun. But you made me smart. :)

[ConnectingRod911]

Great upload! I have never had that explained to me and I am a senior in engineering. Very concise! I Look forward to watching more of your uploads.

[XCeazyX]

Ah, very helpful.

[EJdaTCBman06]

Amazing refresher for my midterm exam tomorrow, thanks a lot!!!

[JohnnyBoyVids1]

as soon as she said "you can take the Diii" i went from being in college back to highschool.

[GethinLlewelyn]

Brillant, so easy to understand now!

[amehunt1]

Awesome.............really clear and easy to understand. Thank you