$\"\"$ $\"\"$

The inequality is $\"\"$ .

Apply subtraction property of inequality: Subtract 9 from each side.

$\"\"$

$\"\"$ (Apply commutative property of addition: a + b = b + a)

$\"\"$ (Apply additive inverse property: $\"\"$ )

$\"\"$ (Apply additive identity property: $\"\"$ )

$\"\"$ (Subtract $\"\"$ ) $\"\"$

Check:

To check, substitute a number less than or equal to $\"\"$ , in $\"\"$ .

$\"\"$ (Substitute b = $\"\"$ )

$\"\"$ (Add: $\"\"$ )

The inequality is true. $\"\"$

The inequality solution set is $\"\"$ .