Determine whether the graphs of each pair of equations are parallel, perpendicular, coinciding, or none of these. 1.x + 3y = 18 3x +9y = 12 3.-3x +2y = 6 2x + 3y = 12 2. 2x - 4y = 8 x-2y = 4 4. x + y = 6 3x - y = 6

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