$\"\"$

Observe the graph, the point $\"\"$ lies on the graph and y varies directly with x and the line passes through the origin.

So, the equation has the form $\"\"$ .

Substitute the values of $\"\"$ in the direct variation equation $\"\"$ to find a.

$\"\"$

Divide each side by negative 2.

$\"\"$

Cancel common terms.

$\"\"$ .

The direct variation equation that relates x and y is $\"\"$ .

If $\"\"$ , then $\"\"$ . $\"\"$

The direct variation equation that relates x and y is $\"\"$ and the value of $\"\"$ .