And are the points of intersection with the coordinate axes of the lines and

MATHEMATICS · Single correct · A Level · Mathematics · Coordinate geometry in the (x y) plane · Coordinate geometry in the (x y) plane

Problem

A, B, C

and

D

are the points of intersection with the coordinate axes of the lines

ax + by = ab

and

bx + ay = ab

, then (1)

A, B, C, D

are concyclic (2)

A, B, C, D

form a parallelogram (3)

A, B, C, D

form a rhombus (4) None of the above