Prove that the lines `2x-3y+1=0, x+y=3, 2x-3y=2 and x=4-y` form a parallelogram.

Prove that the lines 2x-3y+1=0,\ x+y=3,\ 2x-3y=2\ a n d\ x+y=4 form a parallelogram.

Prove that the lines 2x-3y+1=0,\ x+y=3,\ 2x-3y=2\ a n d\ x+y=4 form a parallelogram.

The line 2x+3y=5 , 2x+y=k , 2x-y-1=0

Prove that the three lines 5x+3y-7=0, 3x-4y=10, and x+2y=0 meet in a point.

Prove that the lines y=3x+1,y=4ndy=-3x+2 form an equilateral triangle.

The area of the parallelogram formed by the lines 2x-3y+a=0, 3x-2y-a=0, 2x-3y+3a=0 and 3x-2y-2a=0 in square units , is

Show that the straight lines : x-y-1=0, 4x + 3y = 25 and 2x-3y + 1 = 0 are concurrent.

Show that the straight lines : x-y-1=0 , 4x+3y=25 and 2x-3y+1=0 are concurrent.