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5 votes
5 votes
I dont know how to do this so whatever helps:)

I dont know how to do this so whatever helps:)-example-1
User Edelyne
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2.5k points

1 Answer

15 votes
15 votes

The function which represents the phone rate is a straight line, which can be gotten by the following formula:


y=mt+b

Where m is the slope, and b the point where the y-axis is crossed by the line.

Let's get the slope first:


m=(27-25)/(20-0)=(2)/(20)=(1)/(10)

And b = 25 because (0, 25) is where the line has crossed the cost axis.

Therefore:


y=C(t)=(1)/(10)t+25

User Puravidaso
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2.9k points