The equation is x + 24 = 72.

Apply subtraction property of equality: Subtract 24 from each side.

x + 24 24 = 72 24

x + 0 = 72 24               (Apply additive inverse property: 2424 = 0)

x = 72 24                     (Apply additive identity property: x + 0 = x)

x = 48                               (Subtract: 72 24 = 48)

Check:

To check the solution, substitute x = 48 in original equation.

x + 24 = 72 48+ 24 = 72

72 = 72                            (Add: 48 + 24 = 72)

The statement is true.

Graph the solution on number line.

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• First draw a number line.
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• Mark a dot at 48 on  the number line.
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The value of x = 48.