In about 3 days, i am going to be taking the semester-final, and there are some problems involving slope on the test that we have not learned yet (my class is behind in time). These will be assigned as bonuses, but every little bit helps, so can someone show how to do them, please?

Write an equation of the line that...

Passes through the point (3,1) and has a slope of -3

Passes through the points (2,-5) and (-1,1)

I've got everything else down, but those two are new to me. Thanks in advance.