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Do Now 1/25/10 Take out HW from Friday. Take out HW from Friday. Text page 245, #16-34 evens, #37 Text page 245, #16-34 evens, #37 Copy HW in your planner. Copy HW in your planner. Text page 249, #12-32 evens Text page 249, #12-32 evens In your notebook, answer the following question. Draw a picture of what an equation looks like to you. Then give an example of a multiplication and division equation. In your notebook, answer the following question. Draw a picture of what an equation looks like to you. Then give an example of a multiplication and division equation.
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Homework Text p. 245, #16-34 evens, #37 16) 39/40 16) 39/40 18) -14/27 18) -14/27 20) 6 1/4 20) 6 1/4 22) -20 2/3 22) -20 2/3 24) -42 1/2 24) -42 1/2 26) 10/847 26) 10/847 28) 5 bookmarks 28) 5 bookmarks 30) 6/7 32) -20/33 34) 1 2/3 37) 22
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EQUATION – EQUATION – mathematical sentence formed by placing an “=“ between two expressions y – 8 = 12 y – 8 = 12 22 = 14 + z 11a = 121 11a = 121 5 ÷ x = 30 5 ÷ x = 30 Remember this???
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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. Remember this???
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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! = 10 Left side Right side x 47
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Objective SWBAT use multiplicative inverses to solve equations. SWBAT use multiplicative inverses to solve equations.
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Section 5.6, “Using Multiplicative Inverses to Solve Equations” Multiplicative Inverse Property To solve an equation that has a fractional coefficient, you can multiply each side of the equation by the fraction’s multiplicative inverse. To solve an equation that has a fractional coefficient, you can multiply each side of the equation by the fraction’s multiplicative inverse. MULTIPLICATIVEINVERSE RECIPROCAL =
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MULTIPLICATIVE INVERSE– the product of a number and its multiplicative inverse is 1.
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Solve for x. Multiply each side of the equation by the MULTIPLICATIVE INVERSE of 4/7 Divide (cancel) common factors 1 -3 Multiply
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Try It Out!! Solve
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Solving Multi-Step Equations How can you get the “unknown” by itself? How can you get the “unknown” by itself? Solving Equations with Variables on Both Sides STEP 1- Use distributive property and combine like terms. STEP 2- Collect variables on one side of the equation. 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. Remember this???
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Solve for x. Multiply each side of the equation by the MULTIPLICATIVE INVERSE of -7/15 Divide (cancel) common factors Multiply Subtract 4/5 from each side. Write fractions using LCD 1
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Try It Out!! Solve
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Homework Homework Text page 249, #12-32 evens Text page 249, #12-32 evens
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