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13 May, 15:21

The value of y varies directly with x, and y = 40 when x = - 5. Find y when x = 8

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  1. 13 May, 17:22
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    Answer: y=-64

    Step-by-step explanation:

    From the first sentence: the value of y varies directly with x:

    y∝x

    y=cx where c=variation constant

    When y=40 x=-5

    40=-5c

    Therefore c=-8

    To find y when x=8

    y=cx where c=-8 and x=8

    y=-8*8

    y=-64
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