The expression 54x+36y can be used to find the total of dogs and cats for 6 nights.
Explanation:
Given,
Per night cost for dog = $9
Per night cost for cats = $6
Let,
x be the number of dogs
y be the number of cats
Total amount = 9x+6y
For 6 nights;
Total amount = 6(9x+6y)
Total amount = 54x + 36y
The expression 54x+36y can be used to find the total of dogs and cats for 6 nights.