Solving Equations Using Addition or Subtraction

Tell which property was used to change the first equation into the second equation.

n + 2 = 9

n + 2 - 2 = 9 - 2

• addition property of equality

• subtraction property of equality

• multiplication property of equality

• division property of equality

What is the inverse (opposite) of addition?

• addition

• subtraction

• multiplication

• division

What needs to be done to solve this equation?

z - 5 = 20

• subtract both sides by 5.

• add five to both sides.

• cross out the 5.

• add five on the left side of the equation.

How would we solve the following equation?

x + 3 = 10

• subtract 3 only on the left side of the equation.

• cross out the three.

• Subtract three on both sides of the equation.

• add three on both sides of the equation.

Tell whether W = 24 is a solution to the equation:

• Yes, it is a solution

• No, it is not a solution

Tell whether W = 7 is a solution to the equation: 

• Yes, it is a solution

• No, it is not a solution

Solve the following equation and check your solution:

x - 11 = 9

Solve the following equation and check your solution:

72 = 24 + w

Solve the following equation and check your solution:

a + 5 = 12

Solve the following equation and check your solution:

12 = g - 56