Answer:
The number of electrical appliances is inversely proportional to the number of kids that a couple has. It is a variable that is related to the number of electrical appliances and kids.
Explanation:
As the couple does not have children or is not trying fo more of them, the money that would have been used to raise a kid is instead used to buy electrical appliances. We can see that there is a variable, in this case, the income of the family, that connects the number of electrical appliances and the use of birth control.
