Finite Math Examples

$y = 10$ , $x = 40$

Step 1

When two variable quantities have a constant ratio, their relationship is called a direct variation. It is said that one variable varies directly as the other. The formula for direct variation is $y = k x$ , where $k$ is the constant of variation.

$y = k x$

Step 2

Solve the equation for $k$ , the constant of variation.

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

Step 3

Replace the variables $x$ and $y$ with the actual values.

$k = \frac{10}{40}$

Step 4

Cancel the common factor of $10$ and $40$ .

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Step 4.1

Factor $10$ out of $10$ .

$k = \frac{10 (1)}{40}$

Step 4.2

Cancel the common factors.

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Step 4.2.1

Factor $10$ out of $40$ .

$k = \frac{10 \cdot 1}{10 \cdot 4}$

Step 4.2.2

Cancel the common factor.

$k = \frac{10 \cdot 1}{10 \cdot 4}$

Step 4.2.3

Rewrite the expression.

$k = \frac{1}{4}$

Step 5

Use the direct variation model to create the equation.

$y = k x$

Step 6

Substitute the value of $k$ into the direct variation model.

$y = (\frac{1}{4}) x$

Step 7

Simplify the result to find the direct variation equation.

$y = \frac{x}{4}$