Unit #3 Lesson 8

x f(x) Ask yourself: “What must I do to turn 1 into 2, 2 into 3, 3 into 4, and so on?” A rule for the function is f(x) = x Add 1 to the x value to get the y value.

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Write a function rule for each table. xƒ(x) –1 –4 0 –3 1 –2 2 –1 b. x y –1– a. y = 5xƒ(x) = x – 3

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The journalism class makes $25 per ad sold in the yearbook. If the class sells n ads, how much money will it earn? Write a function rule to describe this relationship. The function rule is f(n) = 25n Relate: is 25 times money earned number of ads sold Write: =25 nf(n)f(n)

The choir spent $100 producing audio tapes of its last performance and will sell the tapes for $5.50 each. Write a rule to describe the choir’s profit as a function of the number of tapes sold. The function rule is f(x) = 5.5x – 100 Relate: is $5.50 times minus cost of tape production total profittapes sold Write: = 5.5 – 100 x f(x)f(x)

1.Write a function rule to describe each relationship. a. the total cost T(c) of c pounds of apples at $.82 a pound b. a scale model s of a moth m that is 6 times the actual size of the moth 2.You borrow $60 to buy a bread-making machine. You charge customers $1.50 a loaf for your special bread. Write a rule to describe your profit as a function of the number n of loaves sold. T(c) = 0.82c s(m) = 6m P(n) = 1.5n - 60