The restriction on the variables x and y are given as follows:
x ∈ W, y ∈ W.
What are the sets of numbers?
The three sets of numbers that appear in this problem are given as follows:
- Whole numbers: non decimal and non negative numbers.
- Integer numbers: non decimal numbers that can be either negative or positive.
- Real numbers: numbers that can be positive or negative, and can also assume decimal values.
The number of tickets sold cannot assume decimal values, hence we know two things:
- x belongs either to the whole numbers or to the integer numbers.
The number of tickets also assumes only values of zero or positive numbers, they cannot be negative, hence it is a whole number and the second option is correct.
More can be learned about the number sets at https://brainly.com/question/28344152
#SPJ1
