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Do Now 10/15/10 Take out HW from Friday. Take out HW from Friday. Text p. 84 Brain Game “Word Scramble” Text p. 84 Brain Game “Word Scramble” Copy HW in your planner. Copy HW in your planner. Text page 99, #8 – 32 evens Text page 99, #8 – 32 evens Be ready to copy Problem of the Week #1 for the 2 nd Marking Period. Be ready to copy Problem of the Week #1 for the 2 nd Marking Period.

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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 E Commutative D Associative N Commutative S Associative O Identity Z DOZENS “What word has six letters but when you subtract one, twelve remain?”

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Objective SWBAT use multiplication and division to solve equations

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Equation- mathematical sentence with an equal sign Like a scale, both sides must be balanced

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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! 2 = 10 Left side Right side x ‘x’ has to be 5 in order to make the equation balanced.

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Section 2.6 “Solving Equations Using Multiplication and Division” How can you get the “unknown” by itself? How can you get the “unknown” by itself? “Undo” the operation by using the INVERSE operation to both sides of the equation. -2y = 28 -2y = 28

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Solving a Multiplication Equation -2y = 28 -2 -2 -2 -2 y = -14 “Undo” multiplication by dividing both sides of the equation

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Check Your Work! -2y = 28 y = -14 -2(-14) = 28 Are both sides equal?

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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

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Solving a Division Equation j = -7 5 5· · 5 j = -35 “Undo” division by multiplying both sides of the equation

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Check Your Work! j = -7 5 j = -35 Are both sides equal? -35 = -7 5

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Try It Out 1). r = -16 -16 ÷ 8 = -2 2). v = 32 32 = 8 4 3). a = -45 -9 = -45 5 1). r ÷ 8 = -2 2). v = 8 4 3). -9 = a 5

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Find the width of the rectangle. Area = 38 cm² x 2 Area = 27 m² z 9 x = 19 cm z = 3 m 2x = 38 cm² 9z = 27 m²

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Homework Text page 99, #8 – 32 evens Text page 99, #8 – 32 evens

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WAR!!! Using your boards solve the equations as fast as possible. If your number is called … you are at WAR!!

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PRECALCULUS 2 Determinants, Inverse Matrices & Solving.

PRECALCULUS 2 Determinants, Inverse Matrices & Solving.

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