We already learned about what expressions are. We will now learn how to evaluate expressions. All this means is to use a value or number in place of a variable and solve.
Ex. 1 Evaluate 2y - 3 when y = 4
We plug in 4 where the y is in the expression. From there you must use the order of operations to solve.
2(4) - 3
8 - 3
5
Some of the problems may get more intense as more variables are added.
Ex. 2
Evaluate 2a + 4b -8 when a = 4 and b = 7
You just need to make sure that you place the right numbers in for the correct variables
2(4) + 4(7) - 8
8 + 4(7) - 8
8 + 28 -8
36 -8
28
You can also use this to solve story problems. We will learn more in class tomorrow.
Here is a copy of the assignment.
Evaluating Expressions
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