Suppose you start with a full tank of gas (15 gallons) in your truck. After driving 4 hours, you now have 4 gallons left. If x is the number of hours you have been driving, then y is

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Suppose you start with a full tank of gas (15 gallons) in your truck. After driving 4 hours, you now have 4 gallons left.

If x is the number of hours you have been driving, then y is the number of gallons left in the tank.

At what rate is the volume of gas in the tank changing? State your answer as a reduced fraction.

1. ______ gallons per hour

2. Find an equation of a line in the form y = mx + b that describes the amount of gas in your tank. 

y= ________

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