# NCERT Class 8 Mathematics Chapter 13 Direct and Inverse Proportion CBSE Board Sample Problems

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## Direct and Inverse Proportion

Sr. no | Term | Description |

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 {k is a positive number}= constant Then x and y are said to vary directly. In such a case if are the values of y corresponding to the values x1, x2 of x respectively then |

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 vice versa) 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 |