Answer: an adult ticket costs $4.5
Explanation:
Let x represent the cost of one adult's ticket.
Let y represent the cost of one child's ticket.
Tickets to a country fair for four adults is and five children cost $33.00. This means that
4x + 5y = 33 - - - - - - - - - - - 1
An adults ticket costs $1.50 more than a child's ticket. This means that
x = y + 1.5
Substituting x = y + 1.5 into equation 1, it becomes
4(y + 1.5) + 5y = 33
4y + 6 + 5y = 33
4y + 5y = 33 - 6
9y = 27
y = 27/9 = 3
x = y + 1.5 = 3 + 1.5 = 4.5