1. Do Now 10/27/09 Take out HW from last night. Copy HW in your planner.
Punchline worksheets #43 & #44
Copy HW in your planner.
Text p. 127, #12-18 even, #22-30 evens, #33
Quiz sections 3.1 & 3.2 Thursday
In your notebook, simplify the expressions below.
-3(x + 4)
-2a – 3 + 4a + 8
-4a – 3(a + 8)

2. “Books Never Written” “Did You Hear About…” JUSTIN HALE BUCK L UPSON
Homework Punchline worksheets #43-44
“Books Never Written”
JUSTIN HALE
BUCK L UPSON
OWEN E LEVIN
“Did You Hear About…”
THE GUY WHO INVESTED IN
FEATHERS BECAUSE HE HEARD
THAT THE STOCK MARKET WAS GOING DOWN

3. Objective
SWBAT solve multi-step equations using algebra

4. -3(x + 4) = -3(x) + (-3)(4) = -3x + (-12) -2a – 3 + 4a + 8 -2a + 4a
Remember this…
-3(x + 4)
= -3(x)
+ (-3)(4)
= -3x
+ (-12)
-2a – 3 + 4a + 8
-2a + 4a
+ (-3) + 8
= 2a
+ 5

5. -4a – 3(a + 8) -4a +(-3)(a + 8) -4a + (-3a) + (-24) -7a + (-24)
Remember this…
-4a – 3(a + 8)
-4a +(-3)(a + 8)
-4a
+ (-3a)
+ (-24)
-7a
+ (-24)

6. Equation- mathematical sentence with an equal sign Like a scale,
both sides must be
EQUAL in order
to be balanced.

7. Section 3.2 “Solving a Multi-Step Equation”
How can you get the “unknown” by itself?
8x - 3x - 10 = 20
Solving Multi-Step Equations
STEP 1-
STEP 2- Combine like terms.
STEP 3- “Undo” addition and/or subtraction.
STEP 4- “Undo” multiplication and/or division.
STEP 5- Solve for the variable.
STEP 6- Check your work.

8. Solving Multi-Step Equations…
Isolate the variable! Get ‘x’ by itself.
8x – 3x – 10 = 20
5x – 10 = 20
Combine like terms.
5x – =
Add 10 to each side.
5x = 30
Simplify. = 30 5 5x
Divide each side by 5.
x = 6
Simplify.

9. 8x – 3x – 10 = 20 x = 6 8(6) – 3(6) – 10 = 20 Check Your Work!
8(6) – 3(6) – 10 = 20
Are both sides equal?

10. Solving a Multi-Step Equation
Solving Multi-Step Equations
STEP 1 - Distributive Property
STEP 2- Combine like terms.
STEP 3- “Undo” addition and/or subtraction.
STEP 4- “Undo” multiplication and/or division.
STEP 5- Solve for the variable.
STEP 6- Check your work.

11. Solving Multi-Step Equations Using the Distributive Property…
6x – 2(x – 5) = 46
Distributive property.
6x – 2x + 10 = 46
Combine like terms.
4x + 10 = 46
Subtract 10 from each side.
4x + 10 – 10 = 46 – 10
Simplify.
4x = 36
Divide each side by 4. = 4x 4 36
Simplify.
x = 9

12. x = 9 6(9) – 2(9 – 5) = 46 Check Your Work! Are both sides equal?
6x – 2(x – 5) = 46
x = 9
6(9) – 2(9 – 5) = 46
Are both sides equal?

13. Guided Practice 2) p – 17p – 6 = -38 1) 6x – 2x + 11 = -5

14. Guided Practice 6x – 2(x + 11) = -6 6x + (-2x) + (-22) = -6

15. Guided Practice 27 = 3c – 3(6 – 2c) 27 = 3c + (-18) + 6c

16. Homework
Text p. 127, #12-18 even, #22-30 evens, #33