The graphs of the equations 5x-15y=8 and 3x-9y=245 are two lines which are
(a) coincident
(b) parallel
(c) intersecting exactly at one point
(d) perpendicular to each other
Here, a1a2=53
b1b2=−15−9=53
and c1c2=−8−245=53
Hence, the lines are coincident.