The formula for a slope is 
. Inserting those values into the equation, we get (12 - 9) / (8 - (-4)) = 3/12 = 1/4
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Answer:
Step-by-step explanation:
Let x represent the number of times Giselle uses the athletic club and y represent money left in account.
We have been given that each time she uses the club, $15 is deducted from the account. The amount used after using the club after x times would be .
We are also told that Giselle pays $220 in advance on her account at the athletic club.
The money left in account after x uses of athletic club would be money in account initially minus amount used for using the club x times.
Therefore, our required equation would be .