If in the general quadratic equation `f(x,y)=0,Delta=0` and `h^2=ab`, then the equation represents.

Options

A. two parallel straight lines
B. two perpendicular straight lines
C. two coincident lines
D. None of the above

Answer

A

Explanation

The general quadratic equation `f(x,y)=ax^2+2hxy+by^2+2gx+2fy+c=0`....(i)
Given, `Delta=0`
`rArr` Eq.(i) represents pair of straight lines and
`therefore` Equation represents two parallel lines.