Quadrilateral ABCD is defined by points A = (-2,1), B = (0,0), C = (3, 1/2), and D = (x4, y4). If ABCD is a projection of a parallelogram whose horizon is the line y = 3, show that D is located at (6/17, 21/17).

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
Section10.4: Analytic Proofs
Problem 18E
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Quadrilateral ABCD is defined by points A = (-2,1), B = (0,0), C = (3, 1/2), and D = (x4, y4). If ABCD is a projection of a parallelogram whose horizon is the line y = 3, show that D is located at (6/17, 21/17).    

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