How do I solve for X

Need solving this second acceleration problem.

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)