Question

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

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

My answer is He subtracted 10 from the right side instead of adding 10 to the right side

Am I right? :)

Answer 1

correct!

Answer 2

Thank you!! :D

Answer 3

it should be:
5x-10=10
5x=20
x=4

Answer 4

your welcome friend!