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If you were to solve the following system by substitution, what would be the best variable to solve for and from what equation? 3x + 6v=9 2x – 10v=13

Respuesta :

The best variable to solve is x=3-2v, after dividing the first equation by 3.

x=4, and v=-1/2

1) Solving that system by Substitution

2) Making then

x=3-2v

2x-10v=13

3) Plugging into the 2nd equation

2(3-2v)-10v=13

6-4v -10v=13

6-14v=13

-14v=13-6

-14v=7

v=-1/2

Plugging into the first equation

x=3-2v

x=3-2(-1/2)

x=3+1

x=4

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