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Substitution

The process of " Substitution " works by solving one of the equations , for one of the variables , and then plugging this back into the other equation, "substituting" for the chosen variable and solving for the other

Solving Systems of Linear Equations

( Using Substitution )

SYSTEMS OF EQUATIONS

When Solving Systems of linear Equations using substitution , your finding the same thing as the solution in a graph which would look like this :

Example

1st

3x-y=7 -y=7-3x

y=-7+3x

2x+3y=1

Substitute

2nd

2x+3(-7+3x)=1

3rd

2x-21+9x=1

+21

x=2

=22

+9x

2x

11x=22

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