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-7X+2Y=18 ltBRgt X+Y=0 In the system o...

`-7X+2Y=18` ltBRgt `X+Y=0`
In the system of equation above, what is the value of x ?

A

`-2`

B

0

C

2

D

4

Text Solution

Verified by Experts

The correct Answer is:
A
Solve the second equation for y in terms of x, thten substitue into the first equation and solve:
` y=-x `
`-7x-2x=18`
`-9x=18`
` x=-2`
(A) is correct
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