When is the substitution method particularly useful for solving systems of equations?

The substitution method is particularly useful when one of the equations is already solved for one variable or can be easily solved for one variable.

Solving Systems of Equations with Substitution

9th Grade•45 minutes

I can solve systems of linear equations using substitution.

The substitution method involves solving for one variable in one equation and substituting that expression into the other equation.

When using substitution, the goal is to create a single equation with one unknown variable.

After solving for one variable, substitute that value back into either of the original equations to solve for the remaining variable.

This lesson includes 8 practice questions to reinforce learning.

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1. What is the main goal when solving a system of equations using substitution?

2. Solve the following system of equations using substitution: y = 3x, x + y = 8

3. In the context of solving systems of equations, what does it mean to 'satisfy both equations'?

...and 5 more questions

Solving linear systems by substitution | Algebra Basics | Khan Academy

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