Question

The table of values below represents a linear function and shows the amount of money in a tip jar at a dry cleaners since the dry cleaners opened for the day. How much was in the tip jar when the dry cleaners opened?

Amount of Money in a Tip Jar at a Dry Cleaners
Number of Hours Since Dry Cleaners Opened
4
5
6
7
8
Amount of Money in Tip Jar ($)
15.50
18.25
21.00
23.75
26.50
$1.75
$2.75
$4.50
$7.25

Answer 1

The amount increases by 18.25 − 15.50 = $2.75 per hour.
Using (4, 15.50): initial amount = 15.50 − 4·2.75 = 15.50 − 11.00 = $4.50.

So there was $4.50 in the tip jar when the dry cleaners opened.