Mathematics
Grade10
Easy

Question

Given that y varies inversely with x, if x = 7 and y = 4, what is y when x = 2 ?

  1. 14
  2. 10
  3. 2
  4. -14

Hint:

Mathematical relationship between two variables which can be expressed by an equation in which the product of two variables is equal to a constant.

The correct answer is: 14


    Here, x varies inversely to y.
    we have, y = k/x
    =>4 = straight k over 7
    =>k = 28.
    And, y = 28 over straight x = 28 over 2 = 14.
    Hence, the correct option is C.

    In inverse variation x1y= x2y2.

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