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Important Formulas: Direct & Inverse Proportion | Mathematics (Maths) Class 8 PDF Download

Terms

1. Direct Proportion

Two quantities x and y are said to be in direct proportion if they increase (decrease) together in such a manner that the ratio of their corresponding values remains constant.
That is if x/y=k= [k is a positive number] = Constant
Then x and y are said to vary directly. In such a case if y1, y2 are the values of y corresponding to the values x1, x2 of x respectively then

Important Formulas: Direct & Inverse Proportion | Mathematics (Maths) Class 8 

2. Inverse proportion
Two quantities x and y are said to be in inverse proportion
if an increase in x causes a proportional decrease in y (and viceversa) in such a manner that the product of their corresponding values remains constant.
That is, if xy = k= Constant
Then x and y are said to vary inversely.
In this case if y1, y2 are the values of y corresponding to the values x1, x2 of x respectively then x1 y1 = x2 y2

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