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 - Practice and Problem-Solving Exercises - Page 311: 59


Equation: y=-1000x+25000 The polar bears will by extinct by 2030

Work Step by Step

First our y-intercept is 25,000 because that is the number of polar bears we started with. Next our slope is -1000 because that is the rate at which the polar bears decline each year. So our equation is: y=-1000x+25000 Now we can find the point at which the polar bears will go extinct by plugging in 0 for y since that is the number of polar bears remaining: 0=-1000x+25000 (subtract 25000 from both sides) -25000=-1000x (divide by -1000 from both sides) 25=x So the polar bears will be extinct in 25 years (2030)
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