Robert has measured the engine speed and horsepower of four different sports cars, listed the data in a table, and graphed the results on a scatterplot. He noticed the points fall closely on a line. Engine Speed, in 1000 rpmHorsepower (hp) 280 4160 5200 6240 Using the data values that Robert collected, select the correct slope and y-intercept. a.) s l o p e equals 1 over 40 semicolon y minus i n t e r c e p t equals 0 b.) s l o p e equals short dash 40 semicolon y minus i n t e r c e p t equals 40 c.) s l o p e equals 40 semicolon y minus i n t e r c e p t equals 2 d.) s l o p e equals 40 semicolon y minus i n t e r c e p t equals 0