Respuesta :

If you want the work then here it is...
 x+2y+-9
 -x       -x
Subtract x on both sides to make it the slope intercept form
 2y=-x-9
 divide by two on both sides
 y=-1/2x-9/2
This is your answer....
 y=-1/2x-9/2

Hope this helped!!!

Hope it's right too!!