Question

1.y=-1 is a solution of the equation x+y=2​

Answer 1

X=3

X + -1 = 2

Go backwards and use inverse operations

Subtract instead of add

2 - -1 = 3

X=3

Double check

3 + -1 = 2

Hope this helps. X=3

Explanation:

Answer 2

x=3

Explanation:

Y=-1

x+y=2

x-1=2

x=3

3-1=2