SOLUTION: Solve each system of equation 3x+2y=12 x+y=3 This problem is really confusing me I tried changing them in y=mx+b but the answer still isn't right and then I tried multiplying th

Question 906715: Solve each system of equation
3x+2y=12
x+y=3
This problem is really confusing me I tried changing them in y=mx+b but the answer still isn't right and then I tried multiplying the bottom equation by -3 and I get another wrong answer. Please help.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
addition/elimination
3x+2y=12
x+y=3
3x+2y=12
-3x-3y=-9
add
-y=3
y=-3
x+y=3
x-3=3
x=6
substitution
3x+2y=12
x+y=3
y=3-x
3x+2(3-x)=12
3x+6-2x=12
x=6
x+y=3
6+y=3
y=-3

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