Please help w part b! right picture this time

How do you solving the solution of each system using elimination?

Given the graphed function below which of the following orders pairs are found on the inverse function

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?