13.two quantities ,x and y, vary directly, if x=5 and y=20, find y when x=45. 14.two quantities ,x and y, vary directly, if x=8 and y=

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13.two quantities ,x and y, vary directly, if x=5 and y=20, find y when x=45.
14.two quantities ,x and y, vary directly, if x=8 and y=48, find y when x=32.

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Ngọc Hoa 3 years 2021-08-30T22:03:49+00:00 1 Answers 10 views 0

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  1. vankhanh
    0
    2021-08-30T22:05:04+00:00
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    Answer: 13. 180, 14. 192

    Step-by-step explanation:

    13.

    What is the relationship of 5 and 20?

    4×5 is 20.

    That means y is 4 times more than x.

    So, if you apply this to x= 45, what is y?

    45×4 =180

    This can be used as a ratio

    5:20

    45: ?

    To get 5 to 45, multiply by 9

    That means you have to equal out the equation by multiply 20 by 9, = 180.

    14.

    8: 48

    32: ?

    8×4 is 32

    48×4=192

    y= 192

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