<PRE><B>Question 368805</B>
There is a table given that says 
weight in pounds,  x:  5,  10,  15
then cost to mail, y: $7, $11, $15 
then it asks..
How much does it cost per pound to mail a package?
Then.. ----
slope = (11-7)/(10-5) = 4/5 = 80 cents per pound
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Equation:
y = mx+b
7 = (4/5)5 + b
b = 3
---
Equation: 
c(x) = (4/5)x + 3
What would a 16 pound package cost to mail?
c(16) = (4/5)*16 + 3
c(16) = 64/5+3 = $15.80
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Cheers,
Stan H.
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