Exercises 39–42, find an equation for the line through P parallel to v. Then sketch the line. Include v in your sketch as a vector starting at the origin.
39. P(-2, 1), v = i - j
40. P(1, 2), v =-i - 2j
41. P(0, -2), v = 2i + 3j
42. P(1, 3), v = 3i - 2j.
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