SOLUTION: how do i solve y=2x; x+2y=8 using substitution?

Question 177054: how do i solve y=2x; x+2y=8 using substitution?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Take the expression for y given by your first equation and substitute (hence the name of the method) that expression in x for y in the second equation, like this:

therefore => =>

Substitute (there's that word again) this value you determined for x back into the first equation, thus:

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