Answer:
The expression to find the cost for x adults and y children after the coupon discount would be:
52.95x + 31.95y - 10x - 10y
Simplifying the expression, we get:
(52.95 - 10)x + (31.95 - 10)y
which can be further simplified to:
42.95x + 21.95y
Therefore, the cost for x adults and y children after the coupon discount would be 42.95x + 21.95y.