Question

Substitution method
x= -2y
2x+5y=-1

Answer 1

So you would put -2y in for x. It would become 2 • -2y + 5y = -1

Simplify and the answer is y = -1

Answer 2

so if X is -2y then u put that in for x and get -4y and then add 5 to get 9