Lesson Presentation

1
Warm Up
Problem of the Day
Lesson Presentation
2
Warm Up Solve. 1. x 5 17 2. 5x 125 3. x
12 86 4. 9x 108
x 22
x 25
x 74
x 12
3
Problem of the Day Stephen forgot his locker
number, but he remembered that the sum of the
digits is 11 and that the digits are all odd
numbers. The locker numbers are from 1 to 120.
What is Stephens locker number?
119
4
Learn to solve equations by multiplying and
dividing fractions.
5
(No Transcript)
6
Additional Example 1A Solving Equations by
Multiplying and Dividing Solve each equation.
Write the answer in simplest form.
3
__
j 25
5
7
Additional Example 1B Solving Equations by
Multiplying and Dividing Solve each equation.
Write the answer in simplest form.
7x
Multiply both sides by the reciprocal of 7.

x
The answer is in simplest form.
x
8
Additional Example 1C Solving Equations by
Multiplying and Dividing Solve each equation.
Write the answer in simplest form.
6
Divide both sides by .


y , or 9
9
Check It Out Example 1A Solve each equation.
Write the answer in simplest form.
3
__
j 19
4
10
Check It Out Example 1B Solve each equation.
Write the answer in simplest form.
3x
Multiply both sides by the reciprocal of 3.

x
x
The answer is in simplest form.
11
Check It Out Example 1C Solve each equation.
Write the answer in simplest form.
4
Divide both sides by .

Multiply by the reciprocal of .

y , or 4
12
Additional Example 2 Problem Solving Application
Dexter makes of a recipe, and he uses 12
cups of powdered milk. How many cups of powdered
milk are in the recipe?
13
Additional Example 2 Continued
The answer will be the number of cups of powdered
milk in the recipe. List the important
information
14
Additional Example 2 Continued
You can write and solve an equation. Let x
represent the number of cups in the recipe.
He uses 12 cups, which is two-thirds of the
amount of the recipe.
15
Additional Example 2 Continued
12 x
Multiply both sides by , the reciprocal of
.
12 x
6
x
Simplify. Then multiply.
1
18 x
There are 18 cups of powdered milk in the recipe.
16
Additional Example 2 Continued
Look Back
Check 12 x
(18)
Substitute 18 for x.
12
Multiply and simplify.
1
18 is the solution.
17
Check It Out Example 2
Nick makes of a recipe, and he uses 8 cups of
wheat flour. How many cups of wheat flour are in
the recipe?
18
Check It Out Example 2 Continued
The answer will be the number of cups of wheat
flour in the recipe.

• List the important information
• He makes of the recipe.
• He uses 8 cups of wheat flour.

19
Check It Out Example 2 Continued
You can write and solve an equation. Let y
represent the number of cups in the recipe.
He uses 8 cups, which is two-fifths of the amount
of the recipe.
20
Check It Out Example 2 Continued
8 y
Multiply both sides by , the reciprocal of
.
8 y
4
y
Simplify. Then multiply.
1
20 y
There are 20 cups of wheat flour in the recipe.
21
Check It Out Example 2 Continued
Look Back
Check 8 y
(20)
Substitute 20 for y.
8
Multiply and simplify.
1
20 is the solution.
22
Lesson Quiz
Solve each equation. Write the answer in simplest
form. 1. 3x 2. x 4 3. x
14 4. 9 5. Rebecca used 3 pt of
paint to paint of the trim in her bedroom.
How many pints will Rebecca use for the trim in
the entire bedroom?
x 16
x
y 63
12