A linear function, f(x) passes through the points (2,8) and (5,17). The function was replaced with f(x + k) resulting in the function g(x). The function g(x) passes
through the points (2,14) and (5,23). What is the value of k?

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.