Solving One-Step Equations Involving Adding and Subtracting

What is the GOAL when solving equations?

• Opposite operation.

• Isolate the variable.

• Isolate the constant.

• Same operation.

HOW are we going to reach our goal?

• Inverse operation.

• Isolate the variable.

• Isolate the constant.

• Same operation.

What step must be taken to solve the following one-step equation?

x + 7 = -13

• Add 13 to both sides.

• Add 7 to both sides.

• Subtract 13 from both sides.

• Subtract 7 from both sides.

What is the answer to the following one-step equation?

x + 7 = -13

• x = 6

• x = -20

• x = 20

• x = -6

What step must be taken to solve the following one-step equation?

-100 = b - 72

• Add 72 to both sides.

• Add 100 to both sides.

• Subtract 72 from both sides.

• Subtract 100 from both sides.

What is the answer to the following one-step equation?

-100 = b - 72

• b = 172

• b = 28

• b = -28

• b = -172

What step must be taken to solve the following one-step equation?

2.5 + d = -4.7

• Add 4.7 to both sides.

• Add 2.5 to both sides.

• Subtract 4.7 from both sides.

• Subtract 2.5 from both sides.

What is the answer to the following one-step equation?

2.5 + d = -4.7

• d = -2.2

• d = 2.2

• d = 7.2

• d = -7.2

What step must be taken to solve the following one-step equation?

2/5 = -2/5 + c

• Add 2/5 to both sides.

• Add 2.5 to both sides.

• Subtract 2/5 from both sides.

• Subtract 2.5 from both sides.

What is the answer to the following one-step equation?

2/5 = -2/5 + c

• c = 4/5

• c = -4/5

• c = 4/10

• c = 0