7b)- Yes it does because the X axis (hours) is going up by 1 going up by 1 and the Y axis (cost) is going up by 9.
7c)- Yes because you can work for half an hour
8a) The graph shows the number of cars being washed and the income of each car washed.
8b) Its a linear relation because the X (cars) axis is going up by 1 and the Y axis (income) is going up by 10
8c) The cost of one car is $10
8e) 15 cars washed = $150 income
13a) T- Time D- Distance
13b) 15 is the number you multiply the variable with
15t (2)= d
13e) Yes because you can stop at any time or distance
13f) 15t(8)= 120km
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9b) 4f(60)= b