Respuesta :

Answer: x=3y−9

Step-by-step explanation:Let's solve for x.

−x+3y=9

Step 1: Add -3y to both sides.

−x+3y+−3y=9+−3y

−x=−3y+9

Step 2: Divide both sides by -1.

−x /−1  =  −3y+9 /−1

x=3y−9