Chapter 5 Section 4Chapter 5 Section 4

Writing a Function RuleWriting a Function Rule

Writing a Rule from a TableWriting a Rule from a Table

A. y = x+2 B. y = x-2 C. y = x+4D. y = 2x E. y = x2

A. y = x+2 B. y = x-2 C. y = x+4D. y = 2x E. y = x2

x y

1 5

2 6

3 7

4 8

x y

1 1

3 9

6 36

9 81

x y

1 -1

2 0

3 1

4 2

x y

1 2

2 4

3 6

4 8

x y

1 3

2 4

3 5

4 6

Word ProblemsWord Problems

A carpenter buys finishing nails by the pound. Each pound of nails costs $1.19. a. Write a function rule to describe this

relationship.

b. How much will 12lb of finishing nails cost?

A carpenter buys finishing nails by the pound. Each pound of nails costs $1.19. a. Write a function rule to describe this

relationship.

b. How much will 12lb of finishing nails cost?

C(x) 1.19x

C(12) 1.19(12)

C(12) $14.28

Word ProblemsWord Problems

Suppose you borrow money from a relative to buy a lawn mower that costs $245. You charge $18 to mow a lawn. Write a rule to describe your profit as a function of the number of lawns mowed.

(total profit) = $18 times (lawns mowed) - (cost of mower)

n = number of lawns mowed P(n) = total profit

P(n) = 18n - 245

Suppose you borrow money from a relative to buy a lawn mower that costs $245. You charge $18 to mow a lawn. Write a rule to describe your profit as a function of the number of lawns mowed.

(total profit) = $18 times (lawns mowed) - (cost of mower)

n = number of lawns mowed P(n) = total profit

P(n) = 18n - 245

AssignmentAssignment

Page 256 Numbers 1-21 odd

Page 256 Numbers 1-21 odd