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

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Question 76272: Solve the system by addition.
–3x + 5y = –18
x – 2y = 7
Answer by checkley75(3666) About Me  (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
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-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