Answer the question please

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

Which one ? is the answer and how to find this answer

You and a friend went to the movies.you spent half your money on tickets. then you spent 1/4 of the money on popcorn, $2 on candy, and $3 on a soda. if you have $1 left, hiw much money did u take to the movies?