`(b x)/a-(a y)/b+a+b=0andb x-a y+2a b`=0

A circle with center (a , b) passes through the origin. The equation of the tangent to the circle at the origin is (a) a x-b y=0 (b) a x+b y=0 b x-a y=0 (d) b x+a y=0

x/a-y/b=0 , a x+b y=a^2+b^2

The straight line x-y-2=0 cuts the axis of x at Adot It is rotated about A in such a manner that it is perpendicular to a x+b y+c=0 . Its equation is: (a) b x-a y-2b=0 (b) a x-b y-2a=0 (c) b x+a y-2b=0 (d) a x+b y+2a=0

A circle with center (a , b) passes through the origin. The equation of the tangent to the circle at the origin is (a) a x-b y=0 (b) a x+b y=0 (c) b x-a y=0 (d) b x+a y=0

2(a x-b y)+(a+4b)=0 , 2(b x+a y)+(b-4a)=0

Triangle formed by variable lines (a+b)x+(a-b)y-2ab=0 and (a-b)x+(a+b)y-2ab=0 and x+y=0 is (where a, b in R )

Triangle formed by variable lines (a+b)x+(a-b)y-2ab=0 and (a-b)x+(a+b)y-2ab=0 and x+y=0 is (where a, b in R )

The three lines a x+b y+c=0, b x+c y+a=0 and c x+a y+b=0 are concurrent only when

Two straight lines are perpendicular to each other. One of them touches the parabola y^2=4a(x+a) and the other touches y^2=4b(x+b) . Their point of intersection lies on the line. x-a+b=0 (b) x+a-b=0 x+a+b=0 (d) x-a-b=0