College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 2, Functions - Section 2.3 - Getting Information from the Graph of a Function - 2.3 Exercises - Page 216: 23


(a) $x=3$ (b) $(3, +\infty)$

Work Step by Step

To solve the given equation graphically, perform the following steps: (1) Treat each side of the equation as a function and graph them on the same coordinate plane. Use a graphing calculator to graph $y=x-2$ (red graph) and $y=4-x$ (blue graph) (refer to the image below for the graph) (2) Identify the point/s where the graphs intersect (a) The point/s where the two graphs intersect represents the instance where the $x-2$ is equal to $4-x$. The x-coordinate of this point is the solution to the given equation. Notice that the graphs intersect at the point $(3, 1)$. The x-coordinate of this point is $3$. Thus, the solution to the given equation is $x=3$. (b) The region where the graph of the function $y=x-2$ is higher than the graph of the function $y=4-x$ is the region where $x-2 \gt 4-x$. Notice that the red graph ($y=x-2$) is higher than the blue graph ($y=4-x$) in the region $(3, +\infty)$. Since the inequality involves $\gt$, then the endpoint $3$ is not part of the solution set. Thus, the solution to the given inequality is $(3, +\infty)$.
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