The inequality is .
Apply subtraction property of inequality: Subtract 3x from each side.
\ (Commutative property:
)
(Additive inverse property:
)
(Additive identity property:
)
(Subtract:
)
Apply subtraction property of inequality: Subtract 9 from each side.
\ (Subtract 9 from each side)
(Additive inverse property:
)
(Additive identity property:
)
(Subtract:
)
Graph the solution set on a number line.
Note: A circle means that this point is not included in the solution set.
Check:
\To Check, substitute a number less than in
(Substitute
)
(Multiply:
)
(Add:
)
The inequality is true.
The inequality solution set is .