ok.. so your system of equations is:
if you set in (1), you should substitute that value in (2) to get values of corresponding to . from here, you will get three values of corresponding to .
if in (1), , then it must be
if you substitute this in (2), you will get
you will get from here, .
substitute this back to
to get the specific value of which is not equal to 0 (corresponding to ).
you should get the values what Mathstud28 got..