The monthly charge for a waste collection service is 1230 dollars for 100 kg of waste and 1590 dollars for 130 kg of waste.

(a) Find a linear model for the cost, $C$, of waste collection as a function of the number of kilograms, $w$.

$C=$

(b) What is the slope of the line found in part (a)?

Slope =

Think about the interpretation of the slope: are the units of the slope

A. kilograms
B. dollars per kilogram
C. kilograms per dollar
D. dollars

(c) What is the value of the vertical intercept of the line found in part (a)?

Value=

Think about the interpretation of the intercept: are the units of the intercept

A. kilograms
B. kilograms per dollar
C. dollars per kilogram
D. dollars