Which system is inconsistent?

Question

A) y=0.5x
x-2y=1

B) 2x-y=8
4x+y=5

C) x+y=0
2x=y

D) y= -1
x=2

Answer: A

Thanks

Answer 1

yes, the two lines in A have the same slope and only one of them goes through the point (0,0) so they never cross.