An electrician charges a set fee of $150 for every house call and then charges an additional $70 per hour. Write an equation for C, C, in terms of t, t, representing the total cost of the electrician's services if the electrician spends tt hours at the house working.

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.