I need help with proportional relationships and graphs

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

Draw a scaled copy of the circle using a scale factor of 2

What are the values of each variable in the diagram below?