Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 5 - Linear Functions - 5-2 Direct Variation - Practice and Problem-Solving Exercises - Page 302: 15



Work Step by Step

start with the function form of a direct variation $y=kx$ now substitute 2 for x and -10 for y $-10=k(2)$ divide both sides by 2 and solve for $k$ $\frac{-10}{2}=\frac{k(2)}{2}$ $k=-5$ write an equation and substitute -5 for k. $y=-5x$ Now solve for x=12 $y=-5(12)$ $y=-60$
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