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

Algebra.Com
Question 279819: how do u solve the following problem:
y=3x
x+y=4

Answer by JBarnum(2146)   (Show Source): You can put this solution on YOUR website!
use substitution method:
y=3x
x+y=4







elimination method:

add






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