Mathematics
Grade10
Easy
Question
x and y vary inversely. Given (5 , 20) , what is the constant k ?
- 4
- 5
- 25
- 100
Hint:
Mathematical relationship between two variables which can be expressed by an equation in which the product of two variables is equal to a constant.
The correct answer is: 100
Here, we are given that x and y vary inversely. We have to find k at (5,20).
We have, y = k/x
=> 20 = k/5
=> k = 20 × 5 = 100.
Hence, the correct option is A.
In inverse variation, we have xy = k.
