SOLUTION: I have to solve a system of equations using substitution to eliminate one variable for y=2x and 3x+y=20.

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Question 455914: I have to solve a system of equations using substitution to eliminate one variable for y=2x and 3x+y=20.
Found 2 solutions by solver91311, richwmiller:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Your first equation guarantees that and are utterly identical. Replace in the second equation with , then solve for


John

My calculator said it, I believe it, that settles it
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Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
plug 2x in for y in the second equation
3x+2x=20
5x=20
x=4
y=2x=8
(4,8)