Answers to Math Exercises: Analytic Geometry of the Straight Line and Plane 
b_{AB }: 4x + 5y – 33 = 0; b_{AC }: 7x – 4y + 6 = 0; b_{BC }: x – 3y + 30 = 0
lie on one straight line
p: x = 2 + t; y = –1 – t; z = 2 + t; t∈R
parametric equations: x = –4 + 2t + 3s; y = t – 4s; z = 2 – t – 3s; s,t∈R
α : x – 2y + 5z – 20 = 0
σ : x – 2y + 2z + 3 = 0
BCV : 3y + z – 12 = 0
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