The data in this table represents a linear function. What is the slope of this line?

−2

−12

12

2

x y
6 −7
8 −11
11 −17
15 −25

The temperature of a chemical solution is originally 21 ? c . a chemist heats the solution at a constant rate, and the temperature of the solution 75 ? c after 1212 12 minutes of heating. the temperature, tt t , of the solution in ? c is a function of x , the heating time in minutes. write the function's formula.