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Evaluating expressions with two variables

We've already evaluated expressions with one variable. Now it's time to do it with two variables.
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Evaluating expressions with two variablesSee video transcript

How to evaluate an expression with two variables

Let's say we want to evaluate the expression 10+2p3r. Well, first we need to know the values of p and r. For example, to evaluate the expression when p=4 and r=5, we just replace p with 4 and r with 5:
So, the expression 10+2p3r equals 3 when p=4 and r=5.

Now, let's practice

Problem 1
Evaluate 6a+4b6 when a=1 and b=3.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi

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