Question 18
If xy =10, then x and y vary___with each other.
Given, xy=10 ∴x=10y Hence, x and y vary inversly with each other.
Question 17
If x=5y, then x and y vary ___with each other.
Question 21
Both x and y are said to vary___with each other, if for some positive number k, xy=k.
Question 43
Two quantities x and y are said to vary directly with each other if for some rational number k, xy =k.