G8

Copyright © Copyright © Swun MathSwun Math (^) Grade 8 Unit 4 Lesson 2 P TE

Homework

Unit 4 · Lesson 2: One-Step Equations

Example # 1 Example # 2

Directions: Identify an inverse operation to use. Solve and check your solution.

푥푥+ 3 = 10

Solution:

• Identify operation in the equation: ADDITION


• Identify inverse operation needed to solve:
  SUBTRACTION
  푥푥+ 3 = 10
  − 3 − 3
  푥푥= 7

Answer: 푥푥= 7

Check. 7 + 3 = 10

10 = 10 ✓

− 3 푚푚= 15

Solution:

• Identify operation in equation: MULTIPLICATION


• Identify inverse operation needed to solve: DIVISION


• Apply the multiplicative inverse of –3: divide by –3 or
  multiply by −^13.
  − 3 푚푚
  − 3 =

15

− 3

푚푚= − 5

Answer: 푚푚= − 5

Check: −3 • −5 = 15

15 = 15 ✓

Example # 3

푥푥

3

=− 9

Solution:

• Identify operation in equation: DIVISION


• Identify inverse operation needed to solve: MULTIPLICATION


• Apply the multiplicative inverse of^13 : multiply by 3.
  3 •

푥푥

3 =−9 •^3 →•푥푥 =−9 •^3

푥푥= −9 • 3

Answer: 푥푥= − 27

Check: −27 3 =− 9

−9 = − 9 ✓