SOLUTION: Solve by substitution:
x+y=12
y=3x
Algebra.Com
Question 34476: Solve by substitution:
x+y=12
y=3x
Answer by Prithwis(166) (Show Source): You can put this solution on YOUR website!
x+y=12
y=3x
x+3x=12
4x=12
x=3
3+y=12
y=9
(x,y) = (3,9)
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