Show that the equation `x^2 + y^2 + x - y = 0` represents a circle find its centre and radius.

Show that the equation 3x^(2)+3y^(2)+6x-4y-1=0 represents a circle Find its centre and radius.

Show that the equations x^2+y^2-6x+4y-36=0 represents a circle,Also find its centre and radius.

Prove that the equation x^2 + y^2 + 2gx + 2fy + c = 0 represents a circle and find its centre and radius.

Solve the following:prove that the equation 3x^2+3y^2-6x+4y-1=0 represents a circle.Find its centre and radius.

Show that the equation x^2+y^2-6x+8y+21=0 represents a circle.Find the centre and radius of the circle.

Show that the equation 3x^(2)+3y^(2)+12x-18y-11=0 represent a circle.Also find its centre and radius.

Show that the equation: 3x^2+3y^2+12x+18y-11=0 represents a circle.

Show that the equaion x ^(2) + y ^(2) - 6x + 4y - 36 = 0 represents a circle. Also, find its centre and radius.

Show that the equation x ^(2) + y ^(2) - 3x + 3y + 10 = 0 does not represent a circle.

Show that the equation x ^(2) + y ^(2) + 2x + 10 y + 26 = 0 represents a point circle. Also, find its centre.