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Do Now 10/22/13 Copy HW in your planner. Copy HW in your planner. Text p. 74, #1-3, 8-13, 38, 39, & 41 Text p. 74, #1-3, 8-13, 38, 39, & 41 In your journal, describe the PROCESS (steps you would take) to solve the following question. Then solve. What is this an example of? In your journal, describe the PROCESS (steps you would take) to solve the following question. Then solve. What is this an example of? + 7 = 10 = ?

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Objective SWBAT solve equations using addition and subtraction SWBAT solve equations using addition and subtraction

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EQUATION – EQUATION – mathematical sentence formed by placing an “=” between two expressions y – 8 = 12 y – 8 = = 14 + z 11a = a = ÷ x = 30 5 ÷ x = 30 Section 2-5 “Solving Equations Using Addition & Subtraction”

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Equation Like a scale, the left side and right side must be the same in order to be balanced! Like a scale, the left side and right side must be the same in order to be balanced! + 7 = 10 Left side Right side x ‘x’ has to be 3 in order to make the equation balanced.

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How can you get the “unknown” by itself? How can you get the “unknown” by itself? “Undo” the operation by using the INVERSE (opposite) operation to both sides of the equation. m + 24 = -18

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Solving Addition Equations… m + 24 = -18 – 24 – 24 –24 m = -42 m = -42 Isolate the variable! Get ‘m’ by itself. To get the ‘m’ by itself get rid of “adding 24.” Do the opposite. “Subtract 24.” Whatever you do to one side of the equation you must do the other side. -18 – (-24) “opp-opp” -42

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Check Your Work! m + 24 = -18 m = -42 (-42) + 24 = -18 Are both sides equal? -18 = = -18

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Try It Out 1). x + 7 = 13 2). -7 = 9 + h 3). -3 = x + 7 4). f + 40 = 31 1). (6) + 7 = 13 1). (6) + 7 = 13 2). -7 = 9 + (-16) 2). -7 = 9 + (-16) 3). -3 = (-10) + 7 3). -3 = (-10) + 7 4).(-9) + 40 = 31 4).(-9) + 40 = 31

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Solving Subtraction Equations… -13 = y – = y – = y 2 = y Isolate the variable! Get ‘y’ by itself. To get the ‘y’ by itself get rid of “subtracting 15.” Do the opposite. “Add 15.” Whatever you do to one side of the equation you must do the other side.

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Check Your Work! -13 = y – 15 2 = y -13 = (2) – 15 Are both sides equal? -13 = = -13

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Try It Out 1). t - 7 = -3 2). 6 = x – (-3) 3). 40 = r – 21 4). -15 = p - 7 1). (4) - 7 = -3 2). 6 = (3) – (-3) 3). 40 = (61) – 21 4). -15 = (-8) - 7

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24 Homework Text p. 74, #1-3, 8-13, 38, 39, & 41 Text p. 74, #1-3, 8-13, 38, 39, & 41

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