The equation is p – 12 = 20.

Apply addition property of equality: Add 12 to each side.

          (Apply additive inverse property: )

                (Apply additive identity property: )

                        (Add: )

Check:

To check the solution, substitute p = 32 in original equation.

p – 12 = 20 32 – 12 = 20

20 = 20                     (Subtract: 32 – 12= 20)

The statement is true.

To graph the solution on the number line:

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• First draw the number line
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• Mark a dot at 32 on the number line
\

The value of p = 32.