iPhone Charging Speed

Time (minutes)

Capacity (% charged)

The origin

The battery has a 0% charge after 40 minutes

It takes 40 minutes to charge the phone to 0%

The battery begins with a 40% charge

The battery dies after 40 minutes

10%

50%

40%

5%

Yes, because it doesn't start at the origin.

Yes, because it shows a constant rate of change.

No, because it doesn't start at the origin.

No, because it shows a constant rate of change.

Leona's Job Earnings

Newspapers Delivered

Total Pay (dollars)

If she delivers 20 newspapers, she will earn $5.

If she earns $20, she will deliver 5 newspapers.

Yes

No

Dog Sitting Earnings

Number of Days

Amount Earned ($)

She walks 0 dogs in 0 hours

She spends 0 dollars in 0 weeks.

She bakes 0 cookies in 0 days.

She earns 0 dollars in 0 days.

$70

$80

$16

$56

Dionne's Boat Rental

Hours Rented

Amount Paid

There is a fixed fee of $15 to rent a boat.

The hourly rate is $15 per hour to rent a boat.

$60

$78

$75

$73

Yes

No

Nan's Weekly Salary

Sales Made

Salary

$200

$50

$150

$250

$100 each sale

$50 each sale

$200 each sale

$250 each sale