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Do Now 10/27/09 Take out HW from last night. Take out HW from last night. Punchline worksheets #43 & #44 Punchline worksheets #43 & #44 Copy HW in your.

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Presentation on theme: "Do Now 10/27/09 Take out HW from last night. Take out HW from last night. Punchline worksheets #43 & #44 Punchline worksheets #43 & #44 Copy HW in your."— Presentation transcript:

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

2 Homework Punchline worksheets #43-44 “Books Never Written” “Did You Hear About…” JUSTIN HALE BUCK L UPSON OWEN E LEVIN 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 SWBAT solve multi-step equations using algebra

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

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

6 Equation- mathematical sentence with an equal sign 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? How can you get the “unknown” by itself? 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. 8x - 3x - 10 = 20

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. Divide each side by 5. x = 6 Simplify. =305 5x5x5x5x5

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

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 6x – 2x + 10 = 46 4x + 10 = 46 4x + 10 – 10 = 46 – 10 4x = 36 x = 9 = 4x4x4x4x4364 Solving Multi-Step Equations Using the Distributive Property… Combine like terms. Subtract 10 from each side. Simplify. Divide each side by 4. Simplify. 6x – 2(x – 5) = 46 Distributive property.

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

13 1) 6x – 2x + 11 = -5 1) 6x – 2x + 11 = -5 2) p – 17p – 6 = -38 2) p – 17p – 6 = -38 4x + 11 = -5 4x = -16 x = p – 6 = p – 6 = p = p = -32 p = 2 p = 2 Guided Practice

14 6x – 2(x + 11) = -6 6x – 2(x + 11) = -6 6x + (-2x) + (-22) = -6 4x + (-22) = -6 4x = 16 Guided Practice x = 4

15 27 = 3c – 3(6 – 2c) 27 = 3c – 3(6 – 2c) 27 = 3c + (-18) + 6c 27 = 9c + (-18) 45 = 9c Guided Practice 5 = c

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


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