Use this formula to solve.. It will be pretty simple : [tex]y_{2} -y_{1} / x_{2}-x_{1}[/tex]
Will Solve one as an example.
7) Let's say (4,9) is {2} and (1,6) is {1}
Then do : 9-1/4-6 = 8/-2=-1/4
Hope this helps! ( use this way to solve the rest!!=) )
