A freight train is carrying goods across the country. The number of gallons of fuel it has used varies directly with the distance it has traveled. See the gra below. 900 - S0- 700 600 - Number 500- of gallons 400- used 300 200- 100- s0 100 150 200 Distance traveled (miles) (a) How many gallons does the train use per mile? I gallon(s) (b) What is the slope of the graph?

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