If the following quantities vary directly, then what is the value of y?

• y = 20

• y = 2

• y = 4

Let there be two values of x be x₁ and x₂ such that two values of y as y₁ and y₂ respectively equal to x₁ and x₂, then x and y are said to vary in inverse proportion, if:

If the following quantities vary directly, then what is the value of x?

• x = 4

•  x = 7

• x = 28

In a direct proportion, two quantities x and y vary with each other such that:

• 
• 

• xy remains constant

In a direct proportion, two quantities x and y vary with each other such that:

• 
• 

• xy remains constant