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

\

The inequality is $\"\"$ .

\

According to subtraction property of inequality: Subtract 20 from each side.

\

$\"\"$

\

$\"\"$ (Apply commutative property of addition: $\"\"$ )

\

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

\

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

\

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

\

Graph the solution set on a number line.

\

$\"number$

\

\

\

Note: A circle means that this point is not included in the solution set. $\"\"$

\

Check:

\

To check, substitute a number greater than $\"\"$ in $\"\"$ .

\

$\"\"$ (Substitute $\"\"$ )

\

$\"\"$ (Product of two different signs is negative)

\

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

\

The inequality is true. $\"\"$

\

The inequality solution is $\"\"$ .