Question 1164330
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Part A) They earn <font color=red>11x dollars</font> in revenue from all the adults
We can think of it like this
1 adult = 11 dollars
x adults = 11x dollars
after multiplying both sides by x


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Part B) This is similar to part A. One child ticket costs $9 each, so selling y of them leads to <font color=red>9y dollars</font>.


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Part C) We earn 11x dollars from all the adults and 9y dollars from all the children. The total revenue is 11x+9y dollars. 
The owner wants to bring in $1600, so we set 11x+9y equal to 1600 to get the equation <font color=red>11x+9y = 1600</font>
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