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17 January, 20:13

What is the answer to this

Find y when x=9 if y varies directly as the square of x and y=245 when x=7

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  1. 17 January, 20:15
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    The most general function here would be y = kx^2.

    Let y=245 and x=7 to find the value of the constant of proportionality k:

    245 = k (7) ^2, or 49k = 245, or 5.

    Then the specific function that applies here is y = 5x^2.
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