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Mathematics, 09.09.2019 17:30 walkinginmypurpose

Which of the following systems is dependent?
x = y = 2 and x+y=-2
x-y= 2 and -2x + 2y = -4
x-y = 2 and 3x – 3y = 2
x-y = 2 and -x-y = -2

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