0
If x1, x2, x3 and y1, y2, y3 are in G.P ,where common ratio is r, then point P (x1,y1), Q (x2,y2), R (x3,y3) are on.
a straight line
an ellipse
a circle
Vertices of a triangle
Lines a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0 will be mutually perpendicular if.
a1 b2 - b1 a2 = 0
a1 a2 + b1 b2 = 0
a12 b2 + b12 a2 = 0
a1 b1 + a2 b2 = 0
4
y - x - 2 = 0
