algebra 2

how do u solve a system of linear equations in three variables?
for example this problem
Ex.1 2x-2y+z=3
5y-z=-31
x+3y+2z=-21

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  1. http://www.mathwarehouse.com/algebra/planes/systems/three-variable-equations.php

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  2. y=3x+4

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  3. 81x2-18x+1

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