This document provides instructions for solving systems of equations using substitution. It outlines the 4 steps as getting one variable by itself, plugging that equation into the other, solving for the variable, and plugging the value back into the original equation. An example system is given as y=5x-1 and 9x-y=17 to demonstrate the substitution method.

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Substitution

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How to do substitution
 #1 Get one of the variables by itself.
 #2 Plug what that equation equals into the other equation.
 #3 Solve for this variable.
 #4 Plug the value you find into the equation from #1.

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An example for y=
 Solve the system using substitution:
y=5x-1
9x-y=17

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Answer