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Algebra variable substitution

This math skill teaches how to substitute numerical values into an algebraic expression with variables, simplify by performing multiplication, and then solve by carrying out addition.

Learn algebra variable substitution

Teaching Transcript

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If 'R' is 3 and 'X' is 5, what does this equation become?

Remember that when we see something like 2 'R' written, it means two times 'R'

So we can substitute our variables. 2 'R' is 2 times 3, and 4 'X' is 4 times 5

Now we multiply and add to solve. The answer is 26

Skill Practice

Algebra variable substitution

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