How do you solve #3x-y= -4# and #3x-y=0#?
There is no solution.
We can try the method of elimination.
Your equations are
Subtract Equation 2 from Equation 1.
This is impossible, so there is no solution.
We can see why there is no solution if we plot the two graphs:
The graphs are parallel and do not intersect. Hence there can be no solution.