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Do Now 10/24/13
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Take out HW from last night.
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Copy HW in your planner.
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Punchline worksheet #38
Text p. 74, #4-6, 14-19, 22-34 evens, 43, 44, 48, & 49
Quiz on equations Monday.
In your journal, write the 2 rules for multiplying and
dividing integers. Then compute the following.
-8 ∙ 9
-63 ÷ (-7)
8(-6)
-18 ÷ (-6)
Homework
Punchline worksheet 38
“What Do Opticians, Optometrists, and
Opthamologists Have In Common?”
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E.
A.
Y.
L.
-15
14
-44
-39
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O.
C.
H.
S.
25
48
-56
34
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L.
E.
W.
N.
29
30
-19
-63
E.
L.
E.
Y.
97
-33
26
60°F
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T. 5
T. -7
H. 44
T. -17
O. 59
O. 0
THEY ALL WENT TO EYE SCHOOL
Objective
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SWBAT use multiplication and division
to solve equations
Equation
mathematical sentence
with an equal sign
Like a scale,
both sides
must be balanced
Equation
2x = 10
Left side
‘x’ has to be 5 in order
to make the equation
balanced.
Like a scale, the left
side and right side must
be the same in order to
be balanced!
Right side
Section 2-5 “Solving Equations Using
Multiplication and Division”
How can you get the “unknown” by itself?
-2y = 28
“Undo” the operation by using the INVERSE
operation to both sides of the equation.
Solving a Multiplication Equation
-2y = 28
-2
-2
y = -14
“Undo”
multiplication
by dividing
both sides of the
equation
Check Your Work! y = -14
-2y = 28
-2(-14) = 28
Are both sides equal?
Try It Out
1). -7t = 63
2). -144 = 12d
3). 10x = 5
1). t = -9
-7(-9) = 63
2). d = -12
-144 = 12(-12)
3). x = ½
10(½) = 5
Solving a Division Equation
5· j = -7 · 5
5
j = -35
“Undo”
division by
multiplying
both
sides of the
equation
Check Your Work!
j = -7
5
-35 = -7
5
j = -35
Are both sides equal?
Try It Out
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1). r ÷ 8 = -2
2). v = 8
4
3). -9 = a
5
1). r = -16
-16 ÷ 8 = -2
2). v = 32
32 = 8
4
3). a = -45
-9 = -45
5
Find the width of the rectangle.
x
2x = 38 cm²
2 Area = 38 cm²
9z = 27 m²
x = 19 cm
9
z Area = 27 m²
z=3m
24
Homework
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Text p. 74, #4-6, 14-19, 22-34 evens, 43, 44, 48, & 49
WAR!!!
Using your boards solve the
equations as fast as possible.
If your number is called …
you are at WAR!!