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I don't know how to solve three variable equations

Algebra
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40=x+y+z

1670=25x+35y+50z

y=2x

Nov 16th, 2014

y=2x

40=x+2x+z

40=3x+z------(1)

1670=25x+70x+50z

1670=95x+50z------(2)

From (1) and (2) you can solve easily

Nov 16th, 2014

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