The equation is –31 = r – 36.

Apply addition property of equality: Add 36 to each side.

              (Apply additive inverse property: )

                    (Apply additive identity property: )

                                  (Add: )

Check:

To check the solution, substitute r = 5 in original equation.

 – 31 = r – 36– 31 = 5 – 36

– 31 =  – 31                     (Subtract: 5 – 36= – 31)

The statement is true.

To graph the solution on the number line:

\
• First draw the number line
\
• Mark a dot at –31 on the number line
\

The value of y = –31.