21. Determine whether the planes are parallel, perpendicular, or neither. If neither, find the cosine of the angle between them. (a) z+ 4y – 3z =1,–3r+ 6y +7z = 0 (b) 2z = 4y – 1, 3r – 12y + 6z = 1 (c) z+y+z=1,1 – y+ z =1

College Algebra
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ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
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Chapter7: Conic Sections
Section7.3: Hyperbolas
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Determine whether the planes are parallel, perpendicular, or neither. If neither, find the cosine of the angle between them.

21. Determine whether the planes are parallel, perpendicular, or neither. If neither, find the cosine of the
angle between them.
(a) z+ 4y – 3z = 1, –3r + by + 7z = 0
(b) 2z = 4y – a, 3x – 12y + 6z = 1
(c) r+y+z = 1, r – y + z = 1
Transcribed Image Text:21. Determine whether the planes are parallel, perpendicular, or neither. If neither, find the cosine of the angle between them. (a) z+ 4y – 3z = 1, –3r + by + 7z = 0 (b) 2z = 4y – a, 3x – 12y + 6z = 1 (c) r+y+z = 1, r – y + z = 1
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