2x + y = 5
x − 2y = 10

y = 5 − 2x
x − 2(5 − 2x) = 10
x − 10 + 4x = 10
5x − 10 = 10
5x = 20
x = 4

2(4) + y = 5
y = −3

She should have substituted 5 + 2x

She combined like terms incorrectly, it should have been 4x instead of 5x

She subtracted 10 from both sides instead of adding 10 to both sides

She made no mistake

Question

2x + y = 5
x − 2y = 10

y = 5 − 2x
x − 2(5 − 2x) = 10
x − 10 + 4x = 10
5x − 10 = 10
5x = 20
x = 4

2(4) + y = 5
y = −3

She should have substituted 5 + 2x

She combined like terms incorrectly, it should have been 4x instead of 5x

She subtracted 10 from both sides instead of adding 10 to both sides

She made no mistake

anonymous · Answer

@dan280291

anonymous · Answer

is the question what did she do wrong?

anonymous · Answer

yer it is

hero · Answer

@sammy5592, what do you believe is the correct answer?

anonymous · Answer

not sure your going to answer to hero but if you follow it through you'll find it is correct.