1. Solving Subtraction Equations
Lesson 16
Introductory Algebra
Solving Subtraction Equations

2. Warm-Up Solve each equation. Show all work and check your solution.
f + 57 = 160
18.9 = x
The sum of p and eight is thirty. Write and solve an equation to find the value of p.

3. Solving Subtraction Equations
Target:
Solve equations involving subtraction.

4. The Addition Property of Equality
For any numbers a, b and c: If a = b, then a + c = b + c

5. Example 1 Solve each equation. Check your solution.
y – 3 = y = 17 (17) – 3 = = x – = x 52 = (59) – 7 m – 6 = m = 8 (8 ) – 6 = 2
Solve each equation. Check your solution.

6. Exit Problems Solve each equation. Show all work and check your
solution.
g – 11 = 30
7.2 = x – 3.8
h – 317 = 482
y minus twenty-three is six. Write and solve an equation to find the value of y.

7. Communication Prompt
What is the benefit of solving equations using the
Properties of Equality rather than the Guess, Check and
Revise method?