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How to Evaluate Expressions

If you need to evaluate an expression, just replace the variable (the letter) with the number given.

Here are some examples:


Evaluate: 3a + 3b if a=2 and b=6

3(2) +3(6)= 6 + 18= 24


Evaluate: 2y-5t-7v if y=1, t=6, v=-1

2(1)-5(6)-7(-1)= -21


Practice Problems: