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The cost depends upon the number of long distance minutes, m, Amy uses. Write the rule that describes Amy's monthly cost.

The cost depends upon the number of long distance minutes, m, Amy uses. Write the rule that describes Amy s monthly cost. class=

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MissPhiladelphia

Minutes(m)              Cost
0                                  20
10                                22
20                                24
50                                30

slope formula:
m = (y1 - y2) / (x1 - x2)
m = (20 - 22) / (0 - 10) = -2/-10 = 1/5 or 0.20

y = (1/5)(x) + 20

The rule that describes Amy's monthly cost is:
m = 1/5x + 20 or m = 0.20x + 20

Where x is the number of minutes spent on the call.

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