In the figure below, the two parallel lines both have slope = 2, and the line that’s perpendicular to
them has
SLOPES OF PARALLEL AND PERPENDICULAR LINES
Parallel lines have the same slope.Perpendicular lines have negative-reciprocal slopes.ABSOLUTE VALUE AND INEQUALITIES
Among the more mind-bending coordinate geometry questions you’ll find on the Math 2 test are
ones like Example 4 that entail graphing absolute value and inequalities.
Example 41. Which of the following shaded regions shows the graph of the inequality