Question

Someone correct me if i'm wrong?

Answer 1

Breann solved the system of equations below. What mistake did she make in her work?

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
Answer
She subtracted 10 from both sides instead of adding 10 to both sides
She should have substituted 5 + 2x
She made no mistake
She combined like terms incorrectly, it should have been 4x instead of 5x

Answer 2

I think the answer is c "she made no mistake"

Answer 3

yup
c