Download Homework Text page 137-139, #32

Do Now 10/2/09
 Take out HW from last night.
 Text page 137-139, #32-62 even
 Copy HW in your planner.
 Text page 144-146, #4-40 even
 In your journal, answer the following questions. How
much do you pay (or your parents) a month for your cell
phone bill? What is your plan? (If you do not have a
cell phone estimate the costs). Do you know how you
are charged per month by your cell phone provider?
Explain.
Homework
Text page 137-139, #32-62 even
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32)
34)
36)
38)
40)
42)
44)
46)
48)
50)
-4.2
-8.3
-6
-11.5
42
-35
35
1/6
-2
72 = ½ (16)x; 9 cm
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52) 49
54) 2.5 mm
56) 245 lb
58) Sally worked 15
hours in a week and
earned $135. How much
did she earn an hour? $9
 60) a. 18ft² b. 6ft.
 62) 47.5 ft²
Objective
 SWBAT solve two-step equations using
algebra
Did you know your cell phone bill
is calculated from a two-step equation?
Equation mathematical sentence
with an equal sign
Like a scale,
both sides must be
EQUAL in order
to be balanced.
Solving a Two-Step Equation
How can you get the “unknown” by itself?
3x + 5 = -19
“Undo” operations by using the INVERSE (opposite)
operation to both sides of the equation.
Solving Two-Step Equations
STEP 1STEP 2STEP 3STEP 4-
“Undo” addition and/or subtraction.
“Undo” multiplication and/or division.
Solve for the variable.
Check your work.
Solving Two-Step Equations…
Isolate the variable! Get ‘x’ by itself.
To get the ‘x’ by
itself first get rid
of “adding 5.”
3x + 5 = -19
-5
-5
Do the opposite.
“Subtract 5.”
Whatever you do to
one side of the equation
you must do the other side.
To get the ‘x’ by
itself get rid
of “multiplying by 3.”
Do the opposite.
“Divide by 3.”
3x = -24
3
3
x = -8
Check Your Work!
3x + 5 = -19
x = -8
3(-8) + 5 = -19
Are both sides equal?
“Two-Step”
Millionaire
Homework
Text page 144-146, #4-40 even