21. Find a and b such that [-1, a, 6] and [b, 8,12] are collinear.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter10: Analytic Geometry
Section10.1: The Rectangular Coordinate System
Problem 35E: Determine the area of ABC if A=2,1,B=5,3,andC is the reflection of the B across the x-axis.
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21. Find a and b such that [-1, a, 6] and [b, 8,12] are collinear.
22. Determine the area of AABC with vertices A(3,-2, 4), B(1,3,2), and C (-1,2,4).
Transcribed Image Text:21. Find a and b such that [-1, a, 6] and [b, 8,12] are collinear. 22. Determine the area of AABC with vertices A(3,-2, 4), B(1,3,2), and C (-1,2,4).
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