What is the solution to the system of equations? use the substitution method.
y-3x=7
21+9x=3y
a. there is no solution
b. there are an infinite number solutions
c. the solution is {1,10}
d. the solution is {28,0}

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

Im literally having a mental breakdown

I’m stuck on this equation, anyone got the answer?