How do i substitute this equation for y (y=2x) in the equation for z (z=x+y)?

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- May 10th 2005, 06:03 AMahsas23algebra
How do i substitute this equation for y (y=2x) in the equation for z (z=x+y)?

- May 10th 2005, 08:51 AMMath Help
you substitute y with 2x

so for z = x + y

z = x +**2x**

or z = 3x