Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 2 - Systems of Linear Equations and Inequalities - 2.1 Systems of Linear Equations - 2.1 Exercises - Page 143: 55

Answer

The system is inconsistent. No solutions.

Work Step by Step

Rewrite the equations in the form $y=mx+b$ $\left[\begin{array}{llllll} 2.5x-0.5y & =-23.5 & ... & 7.5x-1.5y & =23.5 & \\ -0.5y & =-2.5x-23.5 & & -1.5y & =-7.5-23.5 & \\ y & =\frac{-2.5}{-0.5}x-\frac{23.5}{-0.5} & & y & =\frac{-7.5}{-1.5}x-\frac{23.5}{-1.5} & \\ y & =5x+47 & & y & =5x+\frac{47}{3} & \end{array}\right]$ See screenshot below. We generated values for x until we observed that for a change in x of +1, y changes in both cases by +5. So, both have slopes $m=5/1=5.$ For the row in which $x=0$, the y values are different, so the y-intercepts are different. These are parallel lines that do not intersect. The system is inconsistent. No solutions.
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