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: 18


y=-5x y=-60 when x=12

Work Step by Step

Since the form of a direct variation is y=kx, we can substitute the point given to us into this equation: 125=-5k Now lets solve for k, in order to create a general equation for this problem: 125=-5k (Divide both sides by -5) -25=k Now, substitute this value of k into our original equation: y=-5x In order to find y when x=12, substitute that value of x into the equation that we just found: y=-5(12) (Simplify) y=-60
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