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1-26-11 Bellwork #42 HW, red pen, book on desk.

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Solving Equations with Variables on Both Sides Lesson 7-5 p.355

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Variables on Both Sides of the Equations Consider an equation like this: 5x – 8 = 3x What looks different about this equation?

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Variables on Both Sides of the Equations Consider an equation like this: 5x – 8 = 3x What looks different about this equation? Yes, there are x’s on both sides of the =

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Variables on both sides To solve this type of equation we need to get all the x’s on one side of the equation and all the numbers on the other side. So, 5x – 8 = 3x -5x -5xSubtract 5x from both sides -8 = -2x -2 -2Divide both sides by -2 4 = xSolve

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Another example Let’s try this one: 9a + 2 = 4a – 18 -4a -4aSubtract 4a from both sides 5a + 2 = -18(look familiar?) -2 -2Subtract 2 from both sides 5a = -20 5 5Divide both sides by 5 a = -4Solve

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Try This 4x + 4 = 2x + 36 -15 + 6b = -8b + 13

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Try This 4x + 4 = 2x + 36x = 16 -15 + 6b = -8b + 13

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Try This 4x + 4 = 2x + 36x = 16 -15 + 6b = -8b + 13b = 2

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Try This Too Remember to distribute first: 2(x-4) = 3x 8r + 2 = 3(r – 1)

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Try This Too Remember to distribute first: 2(x-4) = 3xx = -8 8r + 2 = 3(r – 1)

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Try This Too Remember to distribute first: 2(x-4) = 3xx = -8 8r + 2 = 3(r – 1)r = -1

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Agenda 1-26-11 PA #7 Pp.357 #10-18 all

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