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How do you solve by substitution $x + 3 y = 23$ $x + 3y = 23$ and $2 x + 4 y = 30$ $2x + 4y = 30$ ?

1 Answer

Jun 21, 2015

I found:
$x = - 1$ $x=-1$
$y = 8$ $y=8$

Explanation:

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