The equation x3+xy2−2y3=0 represents
Equation 6x2−5xy+y2=0 represents____________________
The equation of a straight line passing through the origin and perpendicular to the straight line 2x +3y -7 = 0 is
If in general quadratic equation f(x,y) = 0,△=0
and a + b = 0, then the equation represents