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Substitution Steps
- 1. Find the equation with
a variable by itself
Nota:
- 2x + 3y= 24 2x + y= 8 * = equation with variable by itself
- 2. Solve for the variable by itself.
(Sometime it is already solved for you.)
Nota:
- 2x + y= 8 changes to y= 8 - 2x
- 3. Substitute or plug in the equation
that is solved into the one that isn't.
Nota:
- 2x - 3(8 - 2x)= 24
- 4. Solve this equation and get one
of the answers (y or x).
Nota:
- 2x - 3(8 - 2x) = 24 ... y = -12
- 5. Plug your answer from step
four into one of your equations
(doesn't matter which one)
Nota:
- 2(-6) - 3y = 24 Answer: x = -6, y = - 12
- 6. Solve and get last answer (y
or x).
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