y = (1/2)x + 5 --- (1)
2y = x - 24 --- (2)
From (2), we have:
y = (1/2)x - 12 --- (3)
Compare (1) and (3).
Notice that we have y = (1/2)x + 5 and y = (1/2)x - 12 at the same time, something which is impossible.
Hence, there is no solution to the system of equations.