Which of the following lines whose parametric equations are given below are parallel? Are any the same?
(a) x = 4t + 6, y = 2 − 2t, z = 8t + 1
(b) x = 3 − 6t, y = 3t, z = 4 − 9t
(c) x = 2 − 2t, y = t + 4, z = −4t − 7
(d) x = 2t + 4, y = 1 − t, z = 3t − 2
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