SOLUTION: how do you solve for example: y=3x x+y=12

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Question 87114: how do you solve for example: y=3x
x+y=12
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
solve for example: y=3x ; x+y=12
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Substitute to get:
x+3x=12
4x = 12
x = 3
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Substitute to solve for y:
y=3*3=9
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System solution: x=3,y=9
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Cheers,
Stan H.