Algebra 1

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

Chapter 6 - Systems of Equations and Inequalities - 6-4 Application of Linear Systems - Practice and Problem-Solving Exercises - Page 388: 26

Answer

Correct: 13 Incorrect: 7

Work Step by Step

let call x the amount he got right and y the amount he got wrong Based on the problem, we have: 150x-250y=200 and x+y=20 x=20-y Substitution: 150(20-y)-250y=200 3000-150y-250y=200 -400y=2800 y=7 (2800 divided by 400) x=20-7=13
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