

The inequality is
.
Apply subtraction property of inequality: Subtract 13 from each side.
\
Apply commutative property of addition:
.

(Apply Additive inverse property:
)
(Apply Additive identity property:
)
(Subtract:
)
\
Apply division property of inequality: Divide each side by 4.
\
(Cancel common terms)
(Divide:
)
(Multiply each side by negative one and flip the symbol)
(Product of two same signs is positive)
The solution set is 
Graph the solution set on a number line.
Note: A dot means that this point is included in the solution set.
The solution set is
.
The graph is
\