The equation is 2.9 + z = 1.2

Apply subtraction property of equality: Subtract 2.9 from each side.

z + 2.92.9 = 1.22.9

z + 0 = 1.22.9               (Apply additive inverse property: 2.92.9 = 0)

z = 1.22.9                     (Apply additive identity property: z + 0 = z)

z = 4.1                              (Subtract: 1.22.9 = 4.1)

Check:

To check the solution, substitute z = 4.1 in original equation.

2.9 + z =1.2 2.9 4.1 = 1.2

1.2 =1.2                        (Subtract: 2.9 4.1 = 1.2)

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 4.1  on  the number line.
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The value of z = 4.1.