Answer:
The price for both senior and child tickets are $9 each
Step-by-step explanation:
Since your just trying to find the price for senior citizen and child tickets, we'll use the equation for the first day:
4x + x = $45
5x = $45
x = 9
now plug it for 4x and x
4(9) = $36 <<divide $36 by 4 == $9
$9 for each child ticket