Direct Proportion and Inverse Proportion

- Two quantities,
*x*and*y*, are said to be in**direct proportion**, if they increase (or decrease) together in such a manner that the ratio of their corresponding values remains constant. That is, , where*k*is a positive number.

For example, price of wheat per kg and the weight of wheat that can be brought are in direct proportion as more the weight of wheat, more will be the cost.

- If
*y*_{1},*y*_{2}are the va…

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