Need help please help me please please

Ithink i know it but i want to be sure so can you me out ?

Find │7│. a. 1 over 7 b. –7 c. 7 asap i always mark brailiest who me so

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.