Question

Find parametric equations for the lines in Exercises 1–4.

1. The line through the point P(3, -4, -1) parallel to the vector i + j + k

2. The line through P(1, 2, -1) and Q(-1, 0, 1)

3. The line through P(-2, 0, 3) and Q(3, 5, -2)

4. The line through P(1, 2, 0) and Q(1, 1, -1).

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