Need with this question for a grade

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number tt of tokens james has is a function of gg, the number of games he plays

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

What is the slope of the line that contains the points (-2,1) and (0,-3)