Question

Carlos 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

Answer 1

what happen to -10 any why is it 10?

Answer 2

x - 2(5 - 2x) = 10
x + 10 + 4x = 10 <-bad distributing

Answer 3

so it was suppose to be x-10+4x=10 solve from there to get the right answer

Answer 4

he miss the 10