help me,,, show that the lines 3x-y=7, 2x+6y=5, 9x=3y-4, and x+3y=8 form a rectangle.?

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help me,,, show that the lines 3x-y=7, 2x+6y=5, 9x=3y-4, and x+3y=8 form a rectangle.? resources

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