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December 18, 2014

December 18, 2014

Posted by **Izzy.** on Wednesday, January 4, 2012 at 10:31pm.

Solve the linear system by using substitution.

x=6-4y

2x-3y=1

Explanation too, please!

Please and thanks!

- Math -
**Reiny**, Wednesday, January 4, 2012 at 10:44pmvery very easy

sub x = 6-4y into

2x - 3y = 1

2(6-4y) - 3y = 1

12 - 8y - 3y = 1

-11y = -11

y = 1

then x = 6 - 4(1) = 2

- Math -
**Izzy.**, Wednesday, January 4, 2012 at 10:48pmThank you, but:

How did you go from 12-8y-3y to -11y?

- Math -
**Reiny**, Wednesday, January 4, 2012 at 10:56pm12 - 8y - 3y = 1

12 - 11y = 1 , that should be clear

12**-12**- 11y = 1**-12**

-11y = -11

divide by -11

y = 1

- Math -
**Izzy.**, Wednesday, January 4, 2012 at 11:23pmUnderstood. Thank you.

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