Question

What value of s makes the equation true?

Answer 1

s = -17

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right

Equality Properties

• Multiplication Property of Equality
• Division Property of Equality
• Addition Property of Equality
• Subtraction Property of Equality

Algebra I

• Terms/Coefficients

Explanation:

Step 1: Define

Identify

-8s + 4 = -7s + 21

Step 2: Solve for s

1. [Addition Property of Equality] Add 7s on both sides: -s + 4 = 21
2. [Subtraction Property of Equality] Subtract 4 on both sides: -s = 17
3. [Division Property of Equality] Divide -1 on both sides: s = -17

Answer 2

-17 =s

Explanation:

-8s +4 = -7s +21

Add 8s to each side

-8s+8s +4 = -7s+8s +21

4 = s+21

Subtract 21 from each side

4-21 = s+21-21

-17 =s