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Linear equation variable substitution

Solve a pair of linear equations with a simple variable substitution

This math skill teaches solving a pair of linear equations by substituting the value of one variable from one equation into the other. This helps isolate and solve for the other variable.

Learn linear equation variable substitution

Teaching Transcript

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Solve for 'X' in this linear equation by substituting the second equation into the first

We have 2 'R' in the first equation, and the second equation tells us what 'R' is, so we can make that substitution

Now 2 times 2 'X' is 4 'X', so we have 7 'X' on the left side

So 'X' must be 4

Skill Practice

Solve a pair of linear equations with a simple variable substitution

Test your understanding of linear equation variable substitution by practicing it! Work through the below exercises to use it in practice.