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Do Now 10/15/10 Take out HW from Friday. Copy HW in your planner. Text p. 84 Brain Game “Word Scramble” Text page 99, #8 – 32 evens Be ready to copy Problem of the Week #1 for the 2nd Marking Period. Homework Brain Game text p. 84 8·1=8 3·9=9·3 (2 + 5) + 3 = 2 + (5 + 3) 4x + y = y + 4x 5(7c) = (5 ·7)c xy + 0 = xy Identity Commutative Associative Commutative Associative Identity E D N S O Z “What word has six letters but when you subtract one, twelve remain?” DOZENS Objective SWBAT use multiplication and division to solve equations Equation mathematical sentence with an equal sign Like a scale, both sides must be balanced Equation 2x = 10 Left side ‘x’ has to be 5 in order to make the equation balanced. Like a scale, the left side and right side must be the same in order to be balanced! Right side Section 2.6 “Solving Equations Using Multiplication and Division” How can you get the “unknown” by itself? -2y = 28 “Undo” the operation by using the INVERSE operation to both sides of the equation. Solving a Multiplication Equation -2y = 28 -2 -2 y = -14 “Undo” multiplication by dividing both sides of the equation Check Your Work! y = -14 -2y = 28 -2(-14) = 28 Are both sides equal? Try It Out 1). -7t = 63 2). -144 = 12d 3). 10x = 5 1). t = -9 -7(-9) = 63 2). d = -12 -144 = 12(-12) 3). x = ½ 10(½) = 5 Solving a Division Equation 5· j = -7 · 5 5 j = -35 “Undo” division by multiplying both sides of the equation Check Your Work! j = -7 5 -35 = -7 5 j = -35 Are both sides equal? Try It Out 1). r ÷ 8 = -2 2). v = 8 4 3). -9 = a 5 1). r = -16 -16 ÷ 8 = -2 2). v = 32 32 = 8 4 3). a = -45 -9 = -45 5 Find the width of the rectangle. x 2x = 38 cm² 2 Area = 38 cm² 9z = 27 m² x = 19 cm 9 z Area = 27 m² z=3m Homework Text page 99, #8 – 32 evens WAR!!! Using your boards solve the equations as fast as possible. If your number is called … you are at WAR!!