Assume the y varies inversely with x and y = 5 when x = 1.3. How do you write the indirect variation equation for the relationship?

Sep 5, 2016

$y = \frac{6.5}{x}$

Explanation:

• Write the variation as it is stated:
$y \propto \frac{1}{x}$
• Make it into an equation by multiplying by a constant.
$y = \frac{k}{x}$
• make 'k' the subject and find its value

$k = x \times y = 1.3 \times 5 = 6.5$

• Now that you know a value for 'k', use it in the equation:

$y = \frac{6.5}{x}$