If a m ≠ b l, then the system of equations a x+b y=c and, l x+m y=n (a) has a unique solution (b)...

If a m ≠ b l, then the system of equations a x+b y=c and, l x+m y=n
(a) has a unique solution
(b) has no solution
(c) has infinitely many solutions
(d) may or may not have a solution.

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