Chapter 5 Polynomials and Polynomial Functions - 5.2 Evaluate and Graph Polynomial Functions - 5.2 Exercises - Mixed Review - Page 344: 70

$x=-12$ $y=\frac{1}{4}x$

$x$ varies directly with $y$ $y=kx$ $y=\frac{0.2}{0.8}x$ $y=\frac{1}{4}x$ Determine x by substituting y in the variation equation: $y=\frac{1}{4}x$ $x=\frac{y}{\frac{1}{4}}$ $x=\frac{-3}{-\frac{1}{4}}$ $x=-12$