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

\

The inequality is $\"\"$ .

\

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

\

\

$\"\"$

\

$\"\"$ (Additive inverse property: $\"\"$ )

\

$\"\"$ (Additive identity property: $\"\"$ $\"\"$

\

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

\

$\"\"$ (Distributive property: $\"\"$ )

\

$\"\"$ (Multiply: $\"\"$ ) $\"\"$

\

$\"\"$ (Add 21 to each side)

\

$\"\"$ (Additive inverse property: $\"\"$ )

\

$\"\"$ (Additive identity property: $\"\"$ )

\

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

\

Apply division property of inequality: Divide each side by 3.

\

$\"\"$ \ \

\

$\"\"$ (Cancel common terms)

\

$\"\"$ (Divide: $\"\"$ )

\

$\"\"$

\

Graph the solution set on a number line $\"number$

\

Note: A dot means that this point is included in the solution set. $\"\"$

\

Check:

\

To check, substitute a number 11 or less than or equal to 11, in $\"\"$ .

\

$\"\"$ (Substitute a = 11)

\

$\"\"$ (Substract: $\"\"$ )

\

$\"\"$ (Multiply: $\"\"$ )

\

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

\

The inequality is true. $\"\"$

\

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