One-Step Equations (Addition/Subtraction)

One-Step Equations (Addition/Subtraction)

Review Lesson

Inverse Operations

• The inverse operation means to complete the OPPOSITE operation

• Addition = Subtraction

• Subtraction = Addition

Isolating the Variable

• The goal of finding the value of the variable in an equation is to ISOLATE the variable.

• In order to isolate the variable, we must complete the inverse operation

• When we are using the inverse operation, we must balance the equation (whatever we do to one side of the equal sign, we must do to the other)

One-Step Equation Checklist

• 1. Read the equation

• 2. Determine the inverse operation needed to ISOLATE the variable

• 3. BALANCE the equation, by completing the inverse operation (Draw a line through the equal sign)

• 4. Find the value of the variable

• 5. Check your work by plugging in the value of the variable to the equation

Multiple Choice

s + 7 = 12

• 6

• 5

• 4

• 3

Multiple Choice

r – 11 = 24

• 35

• 32

• 31

• 36

Multiple Choice

n + 15 = 35

• 17

• 18

• 19

• 20

Multiple Choice

x – 7 = 21

• 26

• 28

• 42

• 44

Multiple Choice

x + 22 = 23

• 1

• 2

• 3

• 4

Multiple Choice

x – 9 = 15

• 27

• 26

• 25

• 24

Multiple Choice

g – 14 = 17

• 28

• 29

• 30

• 31

Multiple Choice

p + 20 = 45

• 24

• 25

• 23

• 26

Multiple Choice

b – 17 = 3

• 10

• 20

• 30

• 40

Multiple Choice

p + 21 = 31

• 10

• 15

• 20

• 25