Interpret Slope and Initial Value

What has the GREATER rate of change.

• y = 7x + 10

• Someone who starts with $6 and gets $8 each day.

• y = 5x + 20

• Someone who starts with $8 and gets $6 each day.

What has the greater rate of change?

• 
• y = 19x +39

The trade-in value, V, of a certain model of automobile can be determined using the function V(x)=25000-0.25x, where x is the mileage. Which of the following statements is the best interpretation of the slope?

• The value of the car increases as the mileage increases.

• The selling price of the car when it is new is $25,000.

• The trade-in value of the car decreases $4 for every additional mile driven.

• The trade-in value of the car decreases $1 for every additional 4 miles driven.

Mr. Lewis is having the exterior of his house painted. The painters charge $35 per hour plus the cost of materials. After 20 hours of work, Mr. Lewis owes the painters $840. Assume the relationship is linear. Which statement is TRUE?

• The rate of change is $20 per hour.

• The cost of the materials is $840.

• The $35 rate of change represents the total cost to paint the house

• The cost of the materials was $140.

What is the rate of change for the equation y= 5x - 2

• -2/5

• 5/-2

• 5

• -2

The equation y = 30x + 15 represents the money in Jim's bank account.  Interpret the slope.

• The slope is 15.  It represents how much money Jim starts with.

• The slope is 2.  It represents how much money Jim deposits each day.

• The slope is 30.  It represents how much money Jim starts with.

• The slope is 30.  It represents how much money Jim deposits each day.

The Southeast Polk Junior High teachers go to the Bowl-O-Rama on Friday after school.The cost to bowl per game is $3 and to rent shoes for the night is $2. What represents the slope?

• Number of teachers

• Cost per game

• Cost for shoes

• Number of games

Write an equation for the graph

• y = x + 1

• y = -x + 1

• y = x - 1

• y = -x -1

Write an equation for the graph

• y = 2x - 1

• y = 1/2x - 1

• y = 2x + 1

• y = 1/2x + 1

Write an equation for how much money Sonia has. Sonia starts with $40 in her lunch account and pays $2 each day to eat lunch.

• y = 2x + 40

• y = -2x +40

• y = 40x - 2

• y = -40x + 2