Peter uses the equation y=13/4x 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? a: peter walks a rate of 4/13 miles per hour. b: peter walks at a rate of 4 miles per hour. c: peter walks at a rate of 13/4 miles per hour. d: peter walks at a rate of 13 miles per hour. fast i need