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: 10

$y=\frac{1}{3}x$

Start with a direct variation equation: $y=ax$ Plug in given values: $4=a\times12$ $a=\frac{4}{12}$ $a=\frac{1}{3}$ Hence, the completed equation is: $y=\frac{1}{3}x$ The y-intercept is $0$. Plot a point $(0,0)$. The slope is $\frac{-16}{5}$. Plot another point $(1,\frac{1}{3})$. Draw the graph.