2x-5y= -50 Multiply by 5 to get rid of the fraction and you're left with 5y-30=2(x+10) Distribute the 2 to get 5y-30=2x+20 Add 30 to both sides and you get 5y=2x +50 Subtract 5y from both sides to move it to the other side: 0=2x-5y+50 Subtract 50 from both sides: 2x-5y = -50
