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A driver wants to gauge the fuel efficiency of her vehicle at speeds of 30 mph and above. She notices that traveling at an average

A driver wants to gauge the fuel efficiency of her vehicle at speeds of 30 mph and above. She notices that traveling at an average speed of 45 mph results in a rating of 40 mpg, whereas at an average speed of 50 mph, her car rates 30 mpg.

Find a linear equation to model the gas mileage y for an average speed of x mph.

Find the slope-intercept form of the equation of the line.

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