persamaan garis singgung parabola (y-1)² = -2(x-3) dititik (1,3)

Memakai rumus
(y-b)(y1-b) = -2p[ (x-a) + (x1 -a) ]
(y-1)(3-1) = -2(1/2) [ (x -3) + ( 1-3) ]
2y -2 = -x + 5
x + 2y = 7