Help!

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Help!

ashutosh
Suppose that the system below is consistent for all possible values of f and g.
What can you say about the coeffcients c and d?
x1 + 3x2 = f
cx1 + dx2 = g
a) d=3c
b) d≠3c
c) d=c
d) d≠c

The answer is b. Please explain why this cannot be the case of  infinite solutions.