Find a such that the lines r1 = 1, 2, 1 + t1, 1, 1 and r2 = 3, 1, 1 + ta, 4, 2
Chapter 12, Problem 18(choose chapter or problem)
Find a such that the lines r1 = 1, 2, 1 + t1, 1, 1 and r2 = 3, 1, 1 + ta, 4, 2 intersect.
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