12. 5x 3y + 2z = -1 2x +7y %3D 4x - 7y = 1 %3D 15. 3p + 2g = 11 4g – r = 6 6p + 7r = 4 18. x - 2y + 3z = -7 %3D 2x z = 7 -4x + 3y + 2z = -14 21. 2a + 2b – c = -1 3a + 4b + c = 10 5a – 2b - 3c = 2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section9.2: Systems Of Linear Equations In Two Variables
Problem 9E
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12. 5x 3y + 2z = -1
2x +7y
%3D
4x - 7y = 1
%3D
15. 3p + 2g = 11
4g – r = 6
6p + 7r = 4
18. x - 2y + 3z = -7
%3D
2x
z = 7
-4x + 3y + 2z = -14
21. 2a + 2b – c = -1
3a + 4b + c = 10
5a – 2b - 3c = 2
Transcribed Image Text:12. 5x 3y + 2z = -1 2x +7y %3D 4x - 7y = 1 %3D 15. 3p + 2g = 11 4g – r = 6 6p + 7r = 4 18. x - 2y + 3z = -7 %3D 2x z = 7 -4x + 3y + 2z = -14 21. 2a + 2b – c = -1 3a + 4b + c = 10 5a – 2b - 3c = 2
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