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: 17


Equation: y=2.5x y=30 when x=12

Work Step by Step

First, we know that the form of a direct variation is y=kx so lets plug in the coordinate given to us, in order to find k (the constant). 5=2k (Divide both sides by 2) 2.5=k Now that we know the value of k, lets plug it back into the general equation in order to find the equation of the direct variation. y=2.5x Now that we found our equation, in order to find y when x=12, lets plug in 12 for x in our equation. y=2.5(12) (Simplify) y=30
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