exam Maths Puzzle Numerical Ability

I'm sorry to take up your time once again but I am having trouble understanding what exponential functions are exactly. It is very complicated and confusing to me. Would/could some

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My Problem is to find the slope and y intercept for x= -7. Should my answer be;
1.)Slope:0; y-intercept;none or 2)Slope: undefined; y-intercept:none? I want to say that the answer Dan paid a total of $41.55 last month for his international calls. He makes international calls only to England. Dan pays $0.06 per minute in addition to $15.75 fixed monthly payment. How many minutes of international calls did Dan make last month?