Abcd ?? I'm stuck on this

Which shows the pre image of triangle xyz

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.