Reduce fractions to lowest terms 14/21

Solve 3x-18=2y and 5x-6y=6 by elimination show work

Me. i can't figure out this question. give an explanation too. .

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 t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=