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Unformatted text preview: ∆ Y/ ∆ X = (Y 2 – Y 1 )/(X 2 – X 1 ) (X 2 ,Y 2 ) and (X 1 ,Y 1 ): two points on line i.e. (X 2 ,Y 2 ) = (20,102) and (X 1 ,Y 1 ) = (10,101) ∆ Y/ ∆ X = (102101)/(2010) = 1/10 = .1 Interpretation: As the number of web site hits ___________ by 1, revenue __________ by .1 or ten cents. What about an Inverse Relationship? Y X Changing the Yintercept Y X a < 0 a = 0 a > 0 Example (Course Packet) Fred is going shopping and has $10 to spend. He plans to buy doritos ($2/bag) and/or pepsi ($1/bottle). He wants to spend his entire $10. Fred’s Trip to Kroger: a) Possible Combinations Bags of Doritos (X) Bottles of Pepsi Y b) What is the opportunity cost of one bag of doritos? c) What is the opportunity cost of 1 bottle of Pepsi? d) Let X be # of bags of doritos and Y be # of bottles of pepsi. Find the Yintercept. e) Find the slope of the line. f) Write the full linear equation. g) Graph the function....
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This note was uploaded on 10/12/2010 for the course MKT 230 taught by Professor Holbein during the Spring '10 term at Kentucky.
 Spring '10
 Holbein

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