Question

Suppose y varies inversely with​ x, and y=-5 when x=21. What is an equation for the inverse​ variation?

Answer 1

• y = - 105/x

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General equation for inverse variation is:

• y = k/x, where k- coefficient of variation

Find the value of k by substituting values of x and y:

• - 5 = k/21
• k = -5*21
• k = - 105

Substitute the value of k to get the equation:

• y = - 105/x