Example 4: Write an equation in point-slope form for a line with a slope of –3 which goes
through the point (2, 4).
Example 5: Find an equation of a) a horizontal line and b) a vertical line containing the point
(4, 7)
Example 6: Find an equation of the lines that are a) parallel to and b) perpendicular to
2x + 4y = 5 passing through the point (–1, 2)