How to do this? ? p has to be parallel to q right?

Sorry my answer was wrong, not very good at geometry x=1/3

You can just equal them together to find the value of x. This is due to a theorem that states that if two interior angles are congruent, then the lines are parallel. 

6x=3x+1
-3x -3x                *Put the constants and variables on different sides*

3x=1
---  ---                 *Divide by the number with the variable to isolate it*
3    3

x= 1/3

11 15 15/x

Jonah spent the cost of a movie ticket and split the cost of popcorn, so this needs to be represented by a " + ". Jonah just buy one piece tickets, so 11 is tickets price. We know Jonah's costs represented by the expression 11+15/x, "x" on behalf of the number of he and his friends, so 15 is the price of popcprn. 15/x means one person's money for the poopcorn, including Jonah.