Find conditions on k that will make the following system of equations have a unique solution. To enter your answer, first select whether k should be equal or not equal to specific values, then enter a value or a list of values separated by commas.

Then give a formula in terms of k for the solution to the system, when it exists. Be sure to include parentheses where necessary, e. g. to distinguish 1/(2k) from 1/2k.

3kx+3y = 4
3x+3ky = 1

The system has a unique solution when k (equal or not equal) to ???

The unique solution is x =

y =