1. Solving 1-Step Integer Equations
Objective: To solve one-step integer equations
using addition and subtraction

2. Solving One-Step Equations
Inverse Operation
Operations that “undo” each other
Addition “undoes” subtraction
Subtraction “undoes” addition.

3. Solving Equations Using Addition or Subtraction:
If a number has been added to the variable, subtract that number from both sides of the equation.
If a number has been subtracted from the variable, add that number to both sides of the equation.

4. Replace the variable with your answer.
Example 1: Solve m + 7 = 11
m + 7 = 11
To undo the addition of 7, subtract 7 from both sides of the equal sign.
m = 4
Check the solution.
m + 7 = 11
Replace the variable with your answer.
(4) + 7 = 11
11 = 11 

5. Negative integers Example: Solve -6 = m – 4
To undo the subtraction of 4, add 4 to both sides of the equal sign.
-2 = m
Check the solution.
-6 = m - 4
Replace the variable with your answer.
-6 = (-2) - 4 
-6 = -6

6. Practice
j - 3 = r = 26
r = 30
j = - 9

7. Practice: Solve and Check
1. x+7= x= -9
3. m – 3 = c + 5 = 3

8. Practice: Solve and Check
= x x +5.1 = -7.25