What is the x coordinate of the solution for the system of equations ?

y-x=9
10+2x= -2y

x=?

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=

Write the equation in logarithmic form 8^x=64

15 liters is approximately how many gallons