1. The problem statement, all variables and given/known data Show that the simultanbeous equations [itex]6x-7y+2z=4[/itex] [itex]6x-y-z=7[/itex] [itex]2x-3y+z=k[/itex] where k is a constant, are consisten only when k=1. 3. The attempt at a solution Don't know how to start, the determinent of the co-efficient matrix is -9. This means they are independant, which means I cant express multiples of (1) and (2) for (3) right? I tried to get x and y in terms of z, then substitute for (3)... Doesn't work. I need the method.