Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 5 - Linear Functions - 5-2 Direct Variation - Got It? - Page 302: 2


B. $y=-5x$ ; 75

Work Step by Step

We know direct variation has the equation y=kx. Thus, we plug in the points and solve for k: $ y=kx \\\\ 10=-2k \\\\ k=-5$ We substitute k back in to get the equation: $y=-5x$ We now plug in x=-15: $y=(-5)(-15)=75$
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