Warm ups - PEMDAS. 3-2 Solving Equations with Multiplication and Division Objective: To solve equations using multiplication and division.

Warm ups - PEMDAS

2 236 4

22(3 2)

2[6 (2 4)2]3

3-2 Solving Equations with Multiplication and

Division

Objective: To solve equations using

multiplication and division

Examples 1 – 3 (watch & listen)

5x = 15

5 5

x = 3

-4r = -28

3w = -11

3 3

w = -11

3

Examples 4 – 6 (do with me)

1.7 39.1b 115

x 14

8

c

Example 7 (with a partner)

35

4x

210

5n

Examples 8 - 9

Six times a number is -96. Find the number.

6n = -96

6 6

n = -16

Negative twelve times a number is -156. Find the number.

TOO (Try on your own)

1) -3x = -24

2)

3) 2 4

5 7x

6314

f

Homework

Pg. 153 # 15 – 31 odd

Check your answers in the back of the book.

ObjectiveThe student will be able to:

solve equations using multiplication and division.

1) Solve. -5t = 60

To get the variable by itself, which number needs to be moved?

-5

To move the -5, you have to do the opposite operation. What

operation will we use?

division

1) Solve -5t = 60 -5 -5

t = -12

-5(-12) = 60

1. Draw “the river” to separate the equation into 2 sides

2. Divide both sides by -5

3. Simplify

4. Check your answer

4) Solve

You don’t like fractions? Let’s get rid of them!

“Clear the fraction”

by multiplying both sides of the equation by the denominator.

x

4 12

4) Solve x

4 12

4 · · 4

x = -48

1. Draw “the river”

2. Clear the fraction – multiply both sides by 4

3. Simplify

4. Check your answer

x

4 12

248

14

Math Lab

Homework Please finish worksheets from yesterday

Why did the ant run across the cracker box? What did the Spanish Farmer say to his chicken?

Try these on your own...

x = 3 7

4w = 16

y = 8 -2

2x = 12 3

-2z = -12 3x = 9 -4

The answers...

x = 21 w = 4

y = -16 x = 18

z = 6 x = -12