Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 7 - Algebra: Graphs, Functions, and Linear Systems - 7.3 Systems of Linear Equations in Two Variables - Exercise Set 7.3 - Page 445: 46

Answer

The linear system of equations is: \[\begin{align} & y=\frac{1}{3}x+2 \\ & y=\frac{1}{3}x-2 \end{align}\]

Work Step by Step

Since the solution set is\[\varnothing \], it implies the two equations does not intersect at all. According to the given graph the equations that does not intersect are, \[\begin{align} & x-3y=-6 \\ & x-3y=6 \end{align}\] Solve the above equations to verify. Subtract the two equations as follows: \[\underline{\begin{align} & x-3y=-6 \\ & -x+3y=-6 \end{align}}\] \[\ \ \ \ \ \ \ \ 0\ne -12\] Since, \[0\ne -12\] it implies that the system has no solution and the solution set is\[\varnothing \] Hence, the linear system of equations is: \[\begin{align} & y=\frac{1}{3}x+2 \\ & y=\frac{1}{3}x-2 \end{align}\] With the solution set as\[\varnothing \].
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