The equation is n – 8 = 5.

Apply addition property of equality: Add 8 to each side.

                       (Apply additive inverse property: )

                       (Apply additive identity property: )

                           (Add: )

Check:

To check the solution, substitute n = 13 in original equation.

n – 8 = 5 13 – 8 = 5

5 = 5                               (Subtract: 13 – 8 = 5)

The statement is true.

To graph the solution on the number line:

\
• First draw the number line
\
• Mark a dot at 13 on the number line
\

The value of n = 13.