Algebra 1

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

Chapter 6 - Systems of Equations and Inequalities - 6-2 Solving Systems Using Substitution - Practice and Problem-Solving Exercises - Page 372: 37


20 more girls $33x+37y=350$ $x-y=0$

Work Step by Step

The second equation can be solved for a variable easily (by adding y to each side, getting $x=y$). This can be used to replace a variable in the first equation and solve the equation. The solution of 20 more girls means that, among the 350 students that there are more 20 more girls than boys taking the course.
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