$\"\"$

The expression is $\"\"$ .

$\"\"$ (Substitute $\"\"$ for x and 4 for y)

Both have different signs, so subtract the lesser absolute value from greater absolute value.

$\"\"$ (Different signs: Subtract $\"\"$ from $\"\"$ )

$\"\"$ (Since $\"\"$ > $\"\"$ , the sum has the same sign as $\"\"$ )

$\"\"$

The expression is $\"\"$ .