Chapter 2 Linear Equations and Functions - 2.2 Find Slope and Rate of Change - Guided Practice for Example 4 - Page 85: 12

neither

By using the slope formula, the slopes of the lines are: $m_1=\frac{y_2-y_1}{x_2-x_1}=\frac{-2-7}{-4-1}=\frac{-9}{-5}=1.8.$ $m_2=\frac{y_2-y_1}{x_2-x_1}=\frac{-4-5}{-1-3}=\frac{-9}{-4}=2.25.$ Since $m_1m_2=\ne-1$ and $m_1\ne m_2$, they are neither perpendicular nor parallel.