" Equation "y^(2)-2x-2y+5=0" represents: "

Equation y^(2)-x^(2)+2x-1=0 represents

The equation x^(2)+y^(2)-2x-4y-5=0 represents a

The equation x^2+y^2+2x-4y+5=0 represents a. a point b. a pair of straight lines c. a circle of non zero radius d. none of these

The equation x^(2)+y^(2)+2x-4y+5=0 represents a.a point b.a pair of straight lines c.a circle of non zero radius d.none of these

The equation y^(2)-x^(2)+2x-1=0 , represents

The equation y^(2)-x^(2)+2x-1=0 , represents