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Which of the following systems of equations have nonzero solutions? If the solution is not unique,...

Which of the following systems of equations have nonzero solutions? If the solution is not unique, give the set of all possible solutions.

a)3x+4y=0 b)4x-y=0 c)2x-6y=0

6x+2y=0 4x-y=0 -x+3y=-2

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