SOLUTION: how do u solve the following problem: y=3x x+y=4

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Question 279819: how do u solve the following problem:
y=3x
x+y=4
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
use substitution method:
y=3x
x+y=4
x%2B%283x%29=4
4x=4
x=1
y=3x
y=3%281%29
y=3


elimination method:
3x-y=0
x%2By=4 add
4x=4
x=1
y=3x
y=3%281%29
y=3