number 8 and 9 are confusing and i’d like an explanation on how to do them

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

Solve the problem. a student earned grades of c, a, b, and a in four different courses. those courses had these corresponding numbers of credit hours: 4, 5, 1, and 5. the grading system assigns quality points to letter grades as follows: a = 4, b = 3, c = 2, d = 1, and f = 0. compute the grade point average (gpa) and round the result to two decimal places. 3.40 3.50 8.75 2.18

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.