Chapter 2 Linear Equations and Functions - 2.6 Draw Scatter Plots and Best-Fitting Lines - 2.6 Exercises - Quiz for Lessons 2.4-2.6 - Page 120: 8

$y=-4x$

Start with a direct variation equation: $y=ax$ Plug in given values: $8=a.(-2)$ $a=\frac{8}{-2}$ $a=-4$ Hence, the completed equation is: $y=-4x$. The y-intercept is $0$. Plot a point $(0,0)$. The slope is $-4$. Plot another point $(1,-4)$. Draw the graph.