Chapter 2 - Section 2.3 - Getting Information from the Graph of a Function - 2.3 Exercises - Page 180: 23

$a.\quad x=3$ $b.\quad x > 3$

$a.$ Graph $y=x-2$ (red on the image) and $y=4-x$ (blue). The solution (if it exists) is the x-coordinate of the intersection. Solution: $x=3$ $b.$ Using the graphs of part (a), we see that the red graph is ABOVE the blue graph when $ x > 3$