In order for the function to be linear, what must a be and why?

What is the value of x? enter your answer in the box. photo attached.

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9

Jason went to an arcade to play video games. he paid $2 for every 11 tokens he bought. he spent a total of $16 on tokens. which equation can be used to determine,t, the number lf tokens jason bought