Help again please really appreciate it

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*