I need to know which of these answer choices are correct.

the last the one that were going to select is the correct.

-10x + 2y = -1

+10x +10x

2y= -1 + 10x

2y/2= -1/2 + 10x/2

y = -0.5 + 5x

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.