y varies directly as x

means,

$\"\"$ ----->(1) \ \

The ordered pairs are $\"\"$ \ \

Substitute the ordered pair $\"\"$ in (1) \ \

$\"\"$

Divide each side by 4 \ \

$\"\"$

$\"\"$ \ \ Substitute the ordered pair $\"\"$ and $\"\"$ in (1) \ \

$\"\"$ \ \

$\"\"$

The value of $\"\"$ .