Algebra 1

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

Chapter 6 - Systems of Equations and Inequalities - 6-1 Solving Systems by Graphing - Practice and Problem-Solving Exercises - Page 363: 21

Answer

10 classes

Work Step by Step

x = classes, y = total cost $20 + 3x = y$, $5x = y$ $20 + 3x = 5x$ $20 +3x - 3x = 5x-3x$ $20 = 2x$ $20/2 = 2x/2$ $10 = x$
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