Question

Substation
X=5
2x+y= -15

Answer 1

`2(5) + y = - 15`

`10 + y = - 15`

Subtract 10 both sides

`y = - 25`

Solving for X

No need to you already got X.

Answer

(5,-25)

Answer 2

10+y=-15
y=-15-10
y=-25
Hope my answer helped!