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Solving Equations Using Multiplication and Division Algebra 1 Section 3.2a

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A. Review 1.To solve an equation, you try to isolate the variable. 2.Addition and subtraction are inverse operations that can be used to isolate a variable.

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B. Multiplication and Division are also Inverse Operations 1. They can be used to isolate a variable by a. Multiplying each side by the same number (to get rid of division) Example: = 2 b. Dividing each side by the same number (to get rid of multiplication) Example: 5x = 25 c. Multiplying each side by the reciprocal ( do get rid of a fraction) Example: 12 = x X4X4 -2 3

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Problems: 1. = 8 2. a = -10 3.-3x = 5 X4X4 5656

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4. x = 5.30b = 5 6. = 5757 1717 -3 4 m -4

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7. z = -5 8. t = |-15| 9.-6y = -|27| 3434 1212 3434

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