SOLUTION: I need help understanding this problem. x+3y=15 -8x+3y=-12 So far I have done it 3 times ive got the (3,_) but cant understand how to get 4 using process of elimination

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: I need help understanding this problem. x+3y=15 -8x+3y=-12 So far I have done it 3 times ive got the (3,_) but cant understand how to get 4 using process of elimination      Log On


   



Question 436331: I need help understanding this problem.
x+3y=15
-8x+3y=-12
So far I have done it 3 times ive got the (3,_) but cant understand how to get 4 using process of elimination

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
x+3y=15
-8x+3y=-12
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Subtract and solve for "x":
9x = 27
x = 3
---
Solve for "y":
x + 3y = 15
3 + 3y = 15
3y = 12
y = 4
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Solution: (3,4)
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Cheers,
Stan H.
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