College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 5 - Mid-Chapter Check Point - Page 561: 4

Answer

$(x,4x-5)$ for any real $x$

Work Step by Step

We are given the system: $\begin{cases} y=4x-5\\ 8x-2y=10 \end{cases}$ We will use the substitution method. Substitute the expression of $y$ from Equation 1 into Equation 2 to eliminate $y$ and determine $x$: $\begin{cases} y=4x-5\\ 8x-2(4x-5)=10 \end{cases}$ $8x-2(4x-5)=10$ $8x-8x+10=10$ $10=10$ We got a true statement. Therefore the system's solution is: $(x,y)$ for which $y=4x-5$ The solution can also be written: $(x,4x-5)$ for any real $x$
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