Warm Up

1
Warm Up Simplify. 1. 4 7 ? 3 ? 1 2. 87 ? 15 ?
5 3. 6(9 2) 7 4. 35 ? 7 ? 5
24
84
73
25
2
A variable is a letter or symbol that represents
a quantity that can change.
3
Circle the variables 3x 11 10 2y
4y 6z 3x 12 4y 3
4
A constant is a quantity that does not change.
5
Circle the constants 3x 11 10 2y
4y 6z 3x 12 4y 3
6
An algebraic expression contains one or more
variables and may contain operation symbols. So p
? 7 is an algebraic expression.
150 y
85 5
35 ? w z
10 3 ? 5
To evaluate an algebraic expression, substitute a
number for the variable and then find the value.
7
Substitute the value for y to solve the
expression.
15
50
70
8
Substitute the value for y to solve the
expression.
20
25
28
9
Evaluate the expression to find the missing
values in the table.
2
4
6
10
Evaluate the expression to find the missing
values in the table.
64
80
96
11
You can write multiplication and division
expressions without using the symbols ? and ?.
x ? 3
x ? 3
x(3)
3x
35 y
12
3rd Period Use the textbooks in class but do not
take them out of the room. p. 57 11-27 odds
(and check your answer) All of them if you are
not quiet. Your Unit 3 Test Repair is due
tomorrow. If you are finished, you can put them
in the 3rd period basket.