The three lines 4x + 4y = 1, 8x $$-$$ 3y = 2, y = 0 are

The line 3x + 4y $$-$$ 24 = 0 intersects the X-axis at A and Y-axis at B. Then, the circumcentre of the $$\Delta$$OAB, where O is the origin, is

The product of the perpendiculars from the two points ($$\pm$$ 4, 0) to the line 3x cos$$\phi$$ + 5y sin$$\phi$$ = 15 is

Two straight lines passing through the point A(3, 2) cut the line 2y = x + 3 and X-axis perpendicularly at P and Q, respectively. The equation of the line PQ is