英語の勉強

”Two quantities are proportional if a change in one is always accompanied by a change in the other, and if the changes are always related by use of a constant multiplier. The constant is called the coefficient of proportionality or proportionality constant.

If one quantity is always the product of the other and a constant, the two are said to be directly proportional. x and y are directly proportional if the ratio {\displaystyle {\tfrac {y}{x}}}{\tfrac {y}{x}} is constant.
If the product of the two quantities is always equal to a constant, the two are said to be inversely proportional. x and y are inversely proportional if the product {\displaystyle xy}xy is constant.”

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