Answer:the cost of one kids ticket is $7.8
the cost of one adult ticket is $15.6
Explanation:
Let x represent the cost of one kids ticket.
Let y represent the cost of one adult ticket.
Nine kids and three adults are going to the circus. The total cost of the tickets is $117. It means that
9x + 3y = 117 - - - - - - - - - - - - 1
Kid's tickets are on sale for only half the price of adult adult ticket. This means that
x = y/2
y = 2x
Substituting y = 2x into equation 1, it becomes,
9x + 3 × 2x = 117
9x + 6x = 117
15x = 117
x = 117/15 = 7.8
y = 2x = 2 × 7.8
y = 15.6