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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

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.

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.