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27 January, 21:12

D is partly constant and partly varies with V. When V = 40, D = 150, and when V = 54, D = 192. Find D when V = 73.

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  1. 27 January, 23:29
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    D = mV + C, (compare this to your familiar y = mx + b)

    when V=40, D=150

    150 = 40m + C * *

    when V=54, D=192

    192 = 54m + C * **

    subtract * * from * **

    42 = 14m

    m = 3

    sub into * *, 150 = 120 + C

    C = 30

    so you have D = 3V + 30

    sub in your given value of V
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