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Lesson 3-4 Pages 115-119
Solving Equations by
Multiplying or Dividing
What you will learn!
1. How to solve equations by
using the Division Property
of Equality.
2. How to solve equations by
using the Multiplication
Property of Equality.
What you really need to know!
Step 1 Identify the variable.
Step 2 To isolate the variable,
multiply or divide each side of
the equation by the same
nonzero number to get the
variable by itself.
Step 3 Check the solution.
What you really need to know!
Step 1 Identify the variable.
Step 2 “Undo” the operation!
Step 3 Check the solution.
Balance!
Example 1: Solve and graph solution:
7x = -56
7
7
1x = -8
x = -8
Example 1: Solve and graph solution:
x = -8
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
Example 2: Solve:
8a = -48
8
8
1a = -6
a = -6
Example 3: Solve:
-3b = 27
-3
-3
1b = -9
b = -9
Example 4:
Esteban spent $112 on boxes of
baseball cards. If he paid $14
per box, how many boxes of
cards did Esteban buy?
14b = 112
Example 4: Solve:
14b = 112
14
14
1b = 8
b=8
8 Boxes
Example 5: Solve:
y
 5
 12  5
5
5
y 12
60 5
 y1
5
Example 6: Solve:
y
 9   4
 4
4
4
1y  36
9  4
4
Page 117
Guided Practice
#’s 4-10
Read:
Pages 115-117 with
someone at home
and study
examples!
Homework: Pages 118-119
#’s 12-48 even
#’s 51-69
Lesson Check 3-4
Prepare for Mid-Test!
Pages 138-139
#’s 11-30
Odd Answers in Back of Book!
Page
729
Lesson 3-4
Lesson Check 3-4