College precalc! Please help! I've been struggling.

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

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1