If the equation of f(x) goes through (1, 4) and (4, 6), what points does f^-1(x) go through?

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

Which of the following points is collinear with (-2,1) and (0,3)

How do i do this activity, is appreciated