Chapter 2 - Section 2.3 - Getting Information from the Graph of a Function - 2.3 Exercises - Page 180: 24

$a.\quad x=4$ $ b.\quad x \geq 4$

$a.$ Graph $y=-2x+3$ (red on the image) and $y=3x-7$ (blue). The solution (if it exists) is the x-coordinate of the intersection. Solution: $x=4$ $b.$ Using the graphs of part (a), we see that the red graph is below or intersecting the blue graph when $ x \geq 4$