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Which equation can be used to determine the cost c

Which equation can be used to determine the cost c-example-1
User Jeff Cook
by
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1 Answer

3 votes

c = 8t + 12 (option C)

Step-by-step explanation:

The equation will be in the form of equation of line:

y = mx + c

where y = cost

m = slope, x = change for calls, c = intercept

m = change for calls/change in lenght of call

m = slope = (28-20)/(2-1) = (36 -28)/(3-2)

m = 8/1 = 8

So we know the rate of change is 8

for t = 1, = 8 *1 = 8

for t = t , 8*t =8t

The option in the question with 8t is c = 8t + 12

To confirm if the option is correct, we use any of the value of time:

when t = 2

c = 8(2) + 12 = 16 + 12

c = $28

This is correct from the table. Hence, the equation can be used to determine the cost c ​ is c = 8t + 12 (option C)

User Sajed Zarrinpour
by
8.6k points

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