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If two quantities x and y vary directly with each other, then …………… of their corresponding values remains constant.

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On increasing a, b increases in such a manner that remains ………… and positive, then a and b are said to vary directly with each other.

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If on increasing a, b decreases in such a manner that …………… remains ………. and positive, then a and b are said to vary inversely with each other.

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It two quantities p and q vary inversely with each other then ………. Of their corresponding values remains constant.

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The perimeter of a circle and its diameter vary ………. With each other.