Writing Function Rules

A pizzeria charges $12 per pizza plus an additional $3 for delivery. Which equation represents the cost of having any number of pizzas delivered?

• c = 12p + 3
• c = 12p
• c = 3p
• c = 12 + 3p

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Find the function rule.

• y = 2x

• y = 2x+3

• y = 3x+3

• y = -2x+3

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Find the function rule.

• y = -2x +10
• y = -2x -10
• y = 2x +10
• y = 2x-10

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

A plumber charges a service fee of $40 plus $25 per hour for labor.
(A) Write a function rule for the total cost of hiring the plumber for a job that takes x hours.
(B) How much would it cost to hire the plumber for a job that takes 4 hours?

• (A) y = 40 + 25x
  (B) $140
• (A) y = 40x + 25
  (B) $185
• (A) y = 40 + 25x 
  (B) $185
• (A) y = 40x + 25 
  (B) $140

Tags

CCSS.HSF-BF.A.1A

The school cafeteria has 285 cartons of milk in stock. Each day, a total of 60 cartons are sold. Which function rule best represents this situation?

• y = 285x + 60 
• y = 285x - 60
• y = 285 - 60x
• y = 285 + 60x

Tags

CCSS.HSF-BF.A.1A

A water tank holds 84 gallons. When it began to leak it lost 3 gallons every hour. Write an equation to find the amount of water "y" the tank will have after "x" number of hours.

• y = 84 - 3x
• y = 3 - 84x

Tags

CCSS.8.EE.C.7

CCSS.8.F.A.1

CCSS.8.F.A.3

CCSS.8.F.B.4

Write the function rule for the following table.

•  5x
• 5x + 1
•  x + 5
•  x + 1

Tags

CCSS.8.F.A.1

CCSS.8.F.B.4

The output is eight less than three times the input.

• y = 3x - 8
• 3x - 8
• y = 8 - 3x
• 8 - 3x

Tags

CCSS.8.EE.C.7

CCSS.8.F.A.1

CCSS.8.F.A.3

CCSS.8.F.B.4

The output is 4 less than half the input.

• y = 2x - 4
• y = 4 - 2x
• y = x/2 - 4
• y = 4 - x/2

Tags

CCSS.8.F.A.1

CCSS.8.F.B.4

At what rate did the rain fall?

• 2 cm per hour
• ¹/₄ cm per hour
• ¹/₂ cm per hour
• 4 cm per hour

Tags

CCSS.8.EE.B.5