Algebra 1

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

Chapter 5 - Linear Functions - 5-3 Slope-Intercept Form - Mixed Review - Page 312: 83


Equation: y=3x y=30 when x=10

Work Step by Step

Since we know that y-varies directly with x, we can plug in the values for y and x and solve for k 9=k(3) (Divide both sides by 3) 3=k So plug k in for the general form of a direct variation (y=kx): y=3x Now in order to find the value of y when x=10, plug this value of x into the equation above: y=3(10) y=30
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