Question

Using elimination (combination), which variable will be eliminated first? 5x-y=-21x+y=-3

A) The variable X will cancel out first.
B) The variable Y will cancel out first.
C) Both variables will cancel out first.
D) Neither.

Answer 1

Option B) The variable Y will cancel out first.

Explanation:

we have

5x-y=-21 ----> equation A

x+y=-3 ----> equation B

Solve by elimination

Adds equation A and equation B

5x-y=-21

x+y=-3

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5x+x=-21-3 ----->variable y will be eliminated first

6x=-24

x=-4