For the following system if you isolated X in the second equation to use the substitution method what expression would you substitute into the first equation?
2x+y= 8
-х – Зу = -12

A. зу + 12
B.-3y + 12
C.зу – 12
D.-3y - 12

The substitution method consists of finding the value of a variable from one equation and then putting it into another equation to find the value of other variable.

Given equations are:

[tex]2x+y=8\\-x-3y=-12[/tex]

We have to isolate x in the 2nd equation

[tex]-x-3y=-12[/tex]

Multiplying equation by -1

[tex]x+3y=12[/tex]

Subtracting 3y from both sides

[tex]x+3y-3y=12+3y\\x=12+3y[/tex]

Hence,

Option A. зу + 12 is the right answer

Keywords: linear equations, Variables

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For the following system if you isolated X in the second equation to use the substitution method what expression would you substitute into the first equation? 2x+y= 8 -х – Зу = -12 A. зу + 12 B.-3y + 12 C.зу – 12 D.-3y - 12

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For the following system if you isolated X in the second equation to use the substitution method what expression would you substitute into the first equation?
2x+y= 8
-х – Зу = -12

A. зу + 12
B.-3y + 12
C.зу – 12
D.-3y - 12