How do i go about solving the following system of equations by elimination?
4m-3n=27 and 8m-6n=18
(this was meant to be my previous question, but i accidentally put in the one i already solved for)

Let x have probability generating function gx (s) and let un generating function u(s) of the sequence uo, u1, satisfies p(x > n). show that the (1- s)u(s) = 1 - gx(s), whenever the series defining these generating functions converge.