Algebra 1

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

Chapter 9 - Quadratic Functions and Equations - 9-8 Systems of Linear and Quadratic Equations - Practice and Problem-Solving Exercises - Page 585: 17


Days 0 and 152 had the same number of sales Day 0 had 20 units sold of each Day 152 had 7296 units of each sold

Work Step by Step

$y=48x+20$ $y=-x^2+200x+20$ $-x^2+200x+20 =48x+20$ $-x^2+200x+20-48x-20=48x+20-48x-20$ $-x^2+152x =0$ $x(-x+152)=0$ $x=0$ $-x+152=0$ $-x+152+x=0+x$ $152=x$ $y=48*x+20$ $y=48*152+20$ $y=7296+20$ $y=7316$
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