libbyh71199 libbyh71199

31-03-2014
Mathematics

Answered

Solve the system

-3x+7y=-12

3x+8y=12

Answer :

31-03-2014

line up both equations according to terms and add
-3x + 7y= -12
+ 3x + 8y=12
--------------------------------------
15y= 0
y= 0 so plug back that into either equations and get x=4

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