x + 2y = 6 --- (1)
x = 8 - 2y --- (2)
Rearranging (2), we have x + 2y = 8 --- (3)
Looking at (1) and (3), we can see that x + 2y is equal to 6 and 8 at the same time, something which is not possible.
Hence, there are no solution to this system of equations.