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26 June, 00:04

Which relation is a direct variation that contains the ordered pair (2, 7) ?

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  1. 26 June, 00:33
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    Choices:

    y=4x-1

    y=2/7x

    y=7/2x

    y=7/x

    (2,7) ⇒ x = 2; y = 7

    y = 4x - 1 ⇒ y = 4 (2) - 1; y = 8 - 1; y = 7

    y = 2/7x ⇒ y = 2/7 (2); y = 2/14; y = 1/7

    y = 7/2x ⇒ y = 7/2 (2); y = 7/4; y = 1 3/4

    y = 7/x ⇒ y = 7/2; y = 3 1/2

    Among the choices, only y = 4x - 1 is the direct variation that contains the ordered pair (2,7)
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