Find the Equation that Relates x and y y=20 x=8

$y = 20$ $x = 8$

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.

$k = \frac{20}{8}$

Step 4

Cancel the common factor of $20$ and $8$ .

Factor $4$ out of $20$ .

$k = \frac{4 (5)}{8}$

Cancel the common factors.

Factor $4$ out of $8$ .

$k = \frac{4 \cdot 5}{4 \cdot 2}$

Cancel the common factor.

$k = \frac{4 \cdot 5}{4 \cdot 2}$

Rewrite the expression.

$k = \frac{5}{2}$

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.

$y = (\frac{5}{2}) x$

Step 7

Simplify the result to find the direct variation equation.

$y = \frac{5 x}{2}$

Find the Equation that Relates x and y y=20 x=8

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