17 Find the equation of a curve passing through the point (0, –2) given that at any
point (x, y) on the curve, the product of the slope of its tangent and y coordinate
of the point is equal to the x coordinate of the point 18 At any point (x, y) of a curve, the slope of the tangent is twice the slope of the
line segment joining the point of contact to the point (– 4, –3)