The pair of line represented by 〖ax〗^2+hxy+〖by〗^2= 0 will be orthogonal if.

The pair of line represented by 〖ax〗^2+hxy+〖by〗^2= 0 will be orthogonal if:

	h2 - ab = 0
	a + b = 0
	h2 - ab < 0
	a + b > 0