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25 September, 11:26

Tell whether each equation represents a direct variation. if so, identify the constant of variation.

1. y=4x+9

2. 2y=-8x

3. x+y=0

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Answers (1)
  1. 25 September, 11:47
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    1. Not a direct variation

    2. Direct variation (constant = - 4)

    3. Direct variation (constant = - 1)

    Step-by-step explanation:

    A direct variation is a function of the type

    y = k*x, where k can be any real number

    First case

    1. y=4x+9

    The term 9 interferes with the expression (it creates an offset for the value)

    2. 2y=-8x

    It is a direct variation, y = - 4x

    3. x+y=0

    It is a direct variation, y = - x
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