Solving Addition and Subtraction Equations

Solve the equation

• k = 18

• k = 4

• k = 5

• k = 19

In the equation x + 7 = 12

7 is being added to the variable, x.

How should you show your work to isolate the variable and solve the equation?

• Subtract 7 from both sides. The solution is x = 5.

• Add 7 to both sides.

  The solution is x = 19.

• Multiply both sides by 7 The solution is x = 84.

"Opposite operations" which "undo" each other when solving equations are more commonly called...

• Inverse operations

• math

• variable

• PEMDAS

Solve the equation:

20.5 = x + 4

• x = 16.5

• x = 16.05

• x = 24.5

• x = 24.05

x + 12 = 20

• x = 32

• x = -32

• x = 8

• x = -8

What is the inverse operation needed to solve for p?
765 = p - 254

• subtraction

• addition

• multiplication

• division

x - 62 = 123

What is the first step to isolate the variable and solve the equation?

• Add 62 to each side.

• Subtract 62 from each side.

• Subtract 123 from each side.

• Add 123 to each side.

Which three equations have x = 5 as the solution?

• x + 15 = 10

• 10 - x = 5

• x + 10 = 15

• x - 3 = 2

Solve the equation:

x - 5.5 = 10.5

• x = 15.5

• x = 14.5

• x = 5

• x = 16

Solve the equation

• n = 21

• n = 3

• n = 4

• n = 20