hi, i need help with 2 questions about parametrics. i think they're easy but i can't seem to do them. :(
1) P(2ap,ap^2) and Q(2aq,aq^2) are two points on the parabola x^2=4ay. Given that the gradient of the chord PQ is a constant m, show that the locus of the mid point of PQ is a line...