Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 3 Linear Systems and Matrices - 3.4 Solve Systems of Linear Equations in Three Variables - 3.4 Exercises - Skill Practice - Page 183: 30

Answer

No solution

Work Step by Step

The second equation: $-3x+y-2z=6$ $\rightarrow y=3x+2z+6$ Substitute for x in the first equation: $4x - 8y + 2z = 10$ $4x - 8(3x+2z+6) + 2z = 10$ $4x-24x-16z-48+2z=10$ $-20x-14z=58$ (1) Then continue to substitute for x in the third equation: $2x - 4y + z =8$ $2x - 4(3x+2z+6) + z =8$ $2x-12x-8z-24+z=8$ $-10x-7z=32$ (2) From (1) and (2) we get the system of equations: $-20x-14z=58$ $-10x-7z=32$ Multiply both sides of the second equation by $-2$: $-20x-14z=58$ $20x+14z=-64$ _____________________ $0x+0z=-6$ Hence, there is no solution for this system of equations.
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