warm ups - pemdas. 3-2 solving equations with multiplication and division objective: to solve...
TRANSCRIPT
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Warm ups - PEMDAS
2 236 4
22(3 2)
2[6 (2 4)2]3
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3-2 Solving Equations with Multiplication and
Division
Objective: To solve equations using
multiplication and division
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Examples 1 – 3 (watch & listen)
5x = 15
5 5
x = 3
-4r = -28
3w = -11
3 3
w = -11
3
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Examples 4 – 6 (do with me)
1.7 39.1b 115
x 14
8
c
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Example 7 (with a partner)
35
4x
210
5n
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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.
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TOO (Try on your own)
1) -3x = -24
2)
3) 2 4
5 7x
6314
f
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Homework
Pg. 153 # 15 – 31 odd
Check your answers in the back of the book.
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ObjectiveThe student will be able to:
solve equations using multiplication and division.
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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
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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
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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
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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
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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?
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Try these on your own...
x = 3 7
4w = 16
y = 8 -2
2x = 12 3
-2z = -12 3x = 9 -4
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The answers...
x = 21 w = 4
y = -16 x = 18
z = 6 x = -12