Which expression can be simplified to find the slope of the trend line in the scatterplot?

On a graph, a trend line goes through points (2, 87) and (8, 78).
StartFraction 2 minus 8 Over 78 minus 87 EndFraction
StartFraction 78 minus 87 Over 8 minus 2 EndFraction
StartFraction 78 minus 8 Over 87 minus 2 EndFraction
StartFraction 8 minus 2 Over 78 minus 87 EndFraction

Derek purchased a new gym membership. it costs him seven dollars a month plus two dollars for every time that he visits the gym. he wants to spend less than 25 dollars a month to visit the gym. write an inequality that models the situation using the variable v for the number of visits per month. also find the maximum number of visits he can make to the gym and still keep his cost below 25 dollars a month.