Use implicit differentiation to find the
points where the ** parabola **
defined by
x^{2}-2xy+y^{2}+2x-6y+13 = 0
has horizontal and vertical tangent lines.

The parabola has horizontal tangent lines at the point(s) .

The parabola has vertical tangent lines at the point(s) .

The parabola has horizontal tangent lines at the point(s)

The parabola has vertical tangent lines at the point(s)

You can earn partial credit on this problem.