what’s the answer

Question

A jetliner uses 3,600 gallons of fuel per hour while it is cruising, and there are 15,000 gallons of fuel in the jetliners fuel tank when it begins to cruise. If ya represents the amount of fuel, in thousands of gallons, remaining in the fuel tank after the jetliner cruises for x hours, determine the graph of the solution set for this situation and the equation modeled by the graph.

Answer 1

We are told that the equation needs to represent fuel in thousands of gallons. So, let's first convert to that unit. We start with 15 thousand (that's when time = zero). We are told it burns (loses) 3.6 thousand per hour. So the equation (where "y" is the fuel in thousands of gallons and "x" is time in hours):

y = 15 - 3.6x

The graph would look like this: