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Solving Equations Using Opposite Operations

7.9.1 Solving Equations Using Opposite Operations

7.9.1 • Solving Equations Using Opposite Operations

Warm Up

Solve each equation mentally. Then, enter your answer to check it.

1.

40 − 8 = 40 + n 40 − 8 = 40 + n

− 8 − 8

2.

25 + − 100 = 25 − n 25 + − 100 = 25 − n

100 100

3.

− 3 − 1 2 = 3 + 1 2 n − 3 − 1 2 = 3 + 1 2 n

− 13 − 13

4.

72 − n = 72 + 6 72 − n = 72 + 6

− 6 − 6