Because the lines are parallel there is not solution.
Answer: no solution.
Two lines with the same slope and different y-intercept are parallel, and there is not cut-off point between these line, (there is not solution).
this is a line: y=mx+b
m=slope
b=y-intercept.
We can check it out our answer solving the system.
y=1/2x+4
y=1/2x+3
We solve by equalization method.
1/2x+4=1/2x+3
1/2 x-1/2x=3-4
0≠-1; and we can see that 0 is different to -1, therefore there is not solution.