I need help with this

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

You can find the constant of proportionality by finding the ratio of

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.