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11 October, 09:03

For each function, y varies directly with x. Find each constant variation. Then find the value of y when x = - 0.3.

1. y=2 when x = - 1/2

2. y = 2/3 when x = 0.2

3. y=7 when x = 2

4. y=4 when x = - 3

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Answers (1)
  1. 11 October, 09:17
    0
    You meant "find the constant of proportionality"

    Given y=2 when x = - 1/2, and looking for a formula such as y = k*x,

    substitute the given value (2) for y and the given value (-1/2) for x:

    2 = k * (-1/2). Solve this for k. Then write out the general formula y = k * x, and let x = - 0.3.
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