Need help with 5 and 6 will give branliest to the first to answer

Student price tickets to a movie are $1 and non student tickets are $2. 350 tickets are sold and the total amount made is $450. how many non student tickets were sold ? a) 100 b) 150 c) 200 d)250

Which shows how to solve the equation 3/4x=6 for x in one step?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?