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9 October, 14:30

If y varies directly as x, and y = 25 when x = 5, find y when x = 25.

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  1. 9 October, 18:00
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    Appropriate equation for direct variation: y = mx

    Here, 25=m (5), so that m = 5 and

    y=5x

    Then, if x=25, y=5 (25) = 125 (answer)
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