College Algebra (11th Edition)

Published by Pearson
ISBN 10: 0321671791
ISBN 13: 978-0-32167-179-0

Chapter 5 - Section 5.1 - Systems of Linear Equations - 5.1 Exercises - Page 487: 35

Answer

No solutions. The lines are parallel to each other.

Work Step by Step

We need to solve the given system of equations: $$5x-5y-3=0 ~~~(1) \\ x-y-12=0 ~~~(2)$$ Write each equation in the standard form to obtain the equivalent system: $$5x-5y=3 ~~~(3) \\ x-y=12 ~~~(4)$$ Multiply the second equation by $-5$ to obtain the equivalent equation: $$-5x+5y=-60 ~~~~(5)$$ Add equations $(3)$ and $(5)$ to obtain: $$(5x-5y)+(-5x+5y)=3+(-60) \\ 0= -57 $$ Both variables were eliminated and resulted in a false statement/equation. This means that the system of equations is inconsistent and has no solutions. This means that the lines are parallel.
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