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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
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