Two auto dealers, Winston's and Car Mart, are measuring how quickly they sell cars. Both dealers sell their cars at a steady rate. After 3 days, Winston's has 32 cars left. After 5 days, Winston's has 12 cars left. Answer the questions to compare car sales at the two dealerships.

1. How many cars per day does Car Mart sell? How did you use the table to find this rate?

Also the picture is the number of cars at Car Mart is shown in the table.

Winston's:

After 3 days: 32 cars

After 5 days: 12 cars

Difference in number of cars = 32 - 12 = 20

Difference in number of days: 5 - 3 = 2

Selling rate: 20/2 = 10 cars per day

Car-Mart:

After 2 days: 43 cars

After 3 days: 32 cars

Difference in number of cars = 43 - 32 = 11

Difference in number of days: 3 - 2 = 1

Selling rate: 11/1 = 11 cars per day

Car-Mart sells 1 car per day more than Winston's.

Starting numbers of cars:

Winston's:

Each day less, there are 10 more cars.

Day 3, 32 cars

Day 2, 42 cars

Day 1, 52 cars

Day 0, 62 cars

Winston's started with 62 cars.

Cart-Mart:

Each day less, there are 11 more cars.

Day 2, 43 cars

Day 1, 54 cars

Day 0, 65 cars

Car-Mart's started with 65 cars.

Car-Mart started with more cars. It had 3 more cars than Winston's

(1,4) is on graph of f(x)

f(1) = 4

so 1/4 f(x)

1/4 f(1)

1/4. ×4

1

so point for function 1/4. f(x) is (1,1)