Algebra 1

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

Chapter 4 - An Introduction to Functions - 4-4 Graphing a Function Rule - Lesson Check - Page 257: 5

Answer

The equation is y=-3x+23. The relationship between the number of tricks and biscuits left shows that after every trick the number of biscuits decreases by 3 and thus when no trick is done there are 23 biscuits. The independent variable is the number of tricks and dependent variable is the number of biscuits left.
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Work Step by Step

The slope of the graph is -3 because the amount of biscuits left after every trick is decreased by 3. Also at 0 tricks the number of biscuits is 23 because when x is 1, y is 20 and thus when x is 0, y is 23 which shows that (0,23) is the y- intercept.
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