The first equation is not linear; the second one is.
You have not defined what A, B and C are. They are probably coefficients in some standard equation form, such as
Ax + By + C = 0
If so, you can figure out what the values are in the second case, yourself.
Is 2x+3/y=-1 Linear?
Is 2x-8y=0 Linear? What are A, B, and C
2 answers
Is the A, B, C : 2, 8, 0