This math skill teaches how to substitute negative values for variables in an algebraic expression, then correctly perform operations including multiplication and subtraction to simplify the expression.
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What does this equation become if we substitute in negative 2 for 'C' and negative 5 for 'X'?
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Remember that terms like 6 'C' mean 6 times 'C' so we substituted to get 6 times negative 2, minus 4 times negative 5
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Multiplication is first, so that's negative 12, minus negative 20
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Subtracting a negative is like adding a positive, so our answer is positive 8
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Algebra variable substitution with negatives
Test your understanding of algebra variable substitution with negatives by practicing it! Work through the below exercises to use it in practice.