The answers is b) ab≠1, but I have no clue how to get to that answer... Can someone help me?
What did you get when you tried to solve the system? For instance, you solved the first equation for "x=", plugged this into the second equation, solved for "y=", and... then what?Find conditions on a and b such that the following system has exactly one solution:
. . . . . . .x + by = -1
. . . . .2ax + 2y = 5
The answers is ... "ab ≠ 1", but I have no clue how to get to that answer.