What is the steps needed to take to find the answer to part a

Solve 2x+y=3 x+y=5 in substitution method

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

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.