Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 2 Linear Equations and Functions - 2.5 Model Direct Variation - 2.5 Exercises - Skill Practice - Page 109: 13


See below.

Work Step by Step

If the variables vary directly, then $y=ax$ for some constant $a$. Plugging in the given values, here $-7=a\cdot35\\a=-0.2$. Thus if $x=12$, then $y=12\cdot-0.2=-2.4$
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