Ethan is proving that the slope between any two points on a straight line is the same. he has already proved that triangles 1 and 2 are similar. drag statements and reasons to complete the proof. math item stem image slope from p to q=fe f−e=f′ −e′ slope cannot be a ratio. f' e' =fe definition of slope statement reason definition of slope slope from q to r=f' e' triangle 1 is similar to triangle 2.