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**Writing Function Rules**

Teacher Twins©2014

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Warm Up Graph each function. 1. y = 4x y = -3x + 1

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Writing Functions Rules

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**Write a function rule for the given table of values.**

Think how does -1 become -2? Multiply by 2 or add -1. Try both to see which one works. -1 x 2 = = -2 0 x 2 = = -1 1 x 2 = 2 Does not 2 x 2 = 4 work. works Function Rule y = 2x

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**Write a function rule for the given table of values.**

How does -2 become -10? Guess and check functions until you find the correct one. X 5 does not work + -8 does not work Try multiplying then adding a number or subtracting a number. X3 – 4 -2(3) – 4 = -10 0(3) – 4 = -4 2(3) – 4 = 2 4(3) – 4 = 8 Works y = 3x - 4

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Practice Write the function rule. y = - 3x y = x + 6

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Closure How many rules can you create that make -2 turn into -6?

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