SOLUTION: Solve this system using the Addition Method: 4x + 5y = 10 -12x + 15y - 30

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Question 196520: Solve this system using the Addition Method:
4x + 5y = 10
-12x + 15y - 30
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
4x+5y=10 multiply by 3 & add.
-12x+15y[=]30
12x+15y=30
-------------------
30y=60
y=60/30
y=2 ans.
4x+5*2=10
4x+10=10
4x=10-10
4x=0
x=0 ans.
Proof:
-12*0+15*2=30
30=30