Pedro walks at a rate of 4 miles per hour and runs at a rate of 8 miles per hour. Each week, his exercise program requires him to cover a total
distance of 20 miles with some combination of walking and/or running.
a. Write an equation that represents the different amounts of time
Pedro can walk, x, and run, y, each week.
b. Graph the equation.
c. What is the y-intercept? What does this tell you?
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