# SOLUTION: Solve the system by addition. –3x + 5y = –18 x – 2y = 7

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 Click here to see ALL problems on Linear-systems Question 76272: Solve the system by addition. –3x + 5y = –18 x – 2y = 7 Answer by checkley75(3666)   (Show Source): You can put this solution on YOUR website!-3X+5Y=-18 NOW MULTIPLY THE SECOND EQUATION BY 3 & ADD: 3X-6Y=21 NOW ADD ----------------------------------- -Y=3 Y=-3 ANSWER. -3X+5*-3=-18 -3X-15=-18 -3X=-18+15 -3X=-3 X=-3/-3 X=1 ANSWER. PROOF 1-2*-3=7 1+6=7 7=7