Peter uses the equation y = StartFraction 13 over 4 EndFraction x to model the number of miles that he has walked in x hours. Which statement is true about the proportional relationship that is modeled by Peter’s equation? Peter walks at a rate of StartFraction 4 over 13 EndFraction miles per hour. Peter walks at a rate of 4 miles per hour. Peter walks at a rate of StartFraction 13 over 4 EndFraction miles per hour. Peter walks at a rate of 13 miles per hour.