Question

WILL MARK BRAINLIEST!

Trevor solved the system of equations below. What mistake did he make in his work? (5 points)

2x + y = 5
x − 2y = 10

y = 5 − 2x
x − 2(5 − 2x) = 10
x − 10 + 4x = 10
5x − 10 = 10
5x = 0
x = 0

2(0) + y = 5
y = 5

Answer 1

In the 4th line 5x-10=10

=>5x=10+10 (he wrote minus here)

So 5x=20

x=4

Therefore y = -3