y=mx+c is EQUASHUN for strate line
it mite be tangent tu a kerv (or not)
???????? x2=4ay ????????
perhaps thats spozed tu be x^2=4ay ????????
if so, y=x^2/4a
Tangent tu y is dy/dx
dy/dx av (x^2/4a)=2x/4a=x/2a
wotz that gibberish bout c=-am2?????????????????