4students spent twelve dollars. what is the amount 10 students would spend?

Data are collected to see how many ice-cream cones are sold at a ballpark in a week. day 1 is sunday and day 7 is the following saturday. use the data from the table to create a scatter plot.

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)