An animal shelter estimates that it costs about $6 per day to care for each dog. if y represents the total cost of caring for a single dog for x days, which table models the situation?

If it costs 6 dollars per day, that means that the cost/day=6, or that the total cost divided by the amount of days equals 6. Since cost is y and days is x, we have y/x=6. Multiplying both sides by 6, we have y=6x. Plugging that into each table, we can see that the last table fits the description, with y*6=36, 9*6=54, and 12*6=72. 
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