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: 19


y=2.6x y=31.2 when x=12

Work Step by Step

Since the general form of a direct variation is y=kx, we can substitute the coordinate given to us into this equation in order to find the value of k: 10.4=4k (Divide both sides by 4) 2.6=k Now plug this value of k into the standard equation of a direct variation: y=2.6x In order to find the value of y when x=12, substitute the value of x into the equation above: y=2.6(12) (Simplify) y=31.2
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