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Algebra II., Please Help Me.!.!.! : [ This review is killin me.!?

Problem 1. Do the data in the table represent a direct variation or an inverse variation? Write an equation to model the data in the table. #1. x: 6, 8, 12, 20 y: 9, 12, 18, 30 #2. x: 2, 4, 8, 12 y: 6, 3, 3/2, 1 problem 2. Giselle pays $210 in advance on her account at the athletic club. Each time she uses the club, $15 is deducted from the account. Model the situation with a linear function and a graph. problem 3. You decide to market your own custom computer software. You must invest $3,255 for computer hardware, and spend 2.90 to buy and package each disk. If each program sells for $13.75, how many copies must you sell to break even. Thank you so much.. = )

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1. For problem 1, check out this link: http://www.purplemath.com/modules/variatn.htm For 2, set up an equation! You know that she initially paid $210, and $15 is subtracted each visit. Now let x be a variable representing the number of times she uses the club. So since $15 is subtracted from her paid amount of $210 every x visit, a good function would be: y = 210 - 15x For 3, think about it! Consider the fact that you invest a certain initial amount, and that money must be spent to purchase and package each disk, but you eventually gain that money back as you sell more and more disks. Try to set up an equation representing these facts and determine when your sales are equal to the money you put into the business. Good luck! Hope that helped.
2. prob 1, #1 y = 1.5x (direct variation) #2 y = 12 / x (inverse variation) prob 2. acct balance = $210 - $15*(no. of visits) prob 3 $3255 / (13.75 - 2.90) = 300 to break even.