How are the graphs of the equations 4y-x=3 and 4x-y=1 related?

Question

a parallel

b the same line

c none of these

Answer 1

they are not parallel since the coefficients of the respective variables are not factors of the next one....

and clearly the whole line is not a multiple of the next.

.. . .

parallel lines: ax + by + c = 0 & kax + kby + d = 0

same lines if ax + by + c = 0 & kax + kby + kc = 0

thus the answer is C.