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The label on a gallon of paint says that it will cover from 250 square feet to 450 square feet depending on the surface that is being painted. A painter has 12 gallons of paint on hand. The equation A 12c gives the area A (in square feet) that the 12 gallons of paint will cover if applied at a coverage rate c (in square feet per gallon).

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barnuts

The variable “c” is the independent variable so it is located on the x-axis. 
While the variable “A” is the dependent variable so it is located on the y-axis. 

Using the formula:

A = 12c


At c = 250, A = 3000. 
At c = 450, A = 5400. 


Now draw a point at coordinate (250, 3000), and another point at coordinate (450, 5400). Connect the 2 points with a line.

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