Solve each problem,
Cost of Electricity
7. This graph shows the relationship between the
number of hours (h) a business operates and the
total cost of electricity (c). Find the constant of
proportionality () for this relationship. Using the
value of r. write an equation in the form of
cath that represents the relationship between
the number of hours (h) and the total cost (c).
Cost ($)
200
180
160
140
120
100
80-
60-
40
20
0
1 2 3 4 5 6 7 8 9 10
Business hours (hrs)