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29 July, 09:58

Suppose y is directly proportional to x, also suppose y=15 when x=8.

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  1. 29 July, 10:42
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    If y is directly proportional to x then:

    y=kx, for some integer

    Let's find k, when x=8 then y=15

    y=kx

    (15) = 8k

    15/8=8/8k

    k=15/8

    y=15/8x
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