In Exercises 6972, determine whether the lines and passing
Chapter , Problem 2.1.72(choose chapter or problem)
In Exercises 6972, determine whether the lines and passing through the pairs of points are parallel, perpendicular, or neither. L1 L : 4, 8, 4, 21: 3 L2: 3, 5, 1, 13 L 2: 0
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