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
