For the following system if you isolated X in the second equation to use the substitution method what expression would you subst

Question

Alexxx [7]

3 years ago

14

For the following system if you isolated X in the second equation to use the substitution method what expression would you subst

itute into the first equation?
2x+y= 8
-х – Зу = -12

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

Mathematics

1 answer:

Anestetic [448] · Answer 1 · 2022-05-26T22:42:44+03:00

Option A. зу + 12 is the right answer

Step-by-step explanation:

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:

$2x+y=8\\-x-3y=-12$

We have to isolate x in the 2nd equation

$-x-3y=-12$

Multiplying equation by -1

$x+3y=12$

Subtracting 3y from both sides

$x+3y-3y=12+3y\\x=12+3y$

Hence,

Option A. зу + 12 is the right answer

Keywords: linear equations, Variables

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