Question

Find the value of x showing your steps. identify the postulate that allowed you to solve for x.​

Answer 1

x = 14

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

Algebra I

• Equality Properties

Geometry

• Congruency
• All angles in a triangle add up to 180°

Explanation:

Step 1: Define

3(x + 7)° = 63°

3(x + 7)° + 63° + y° = 180°

Step 2: Solve for x

1. Divide 3 on both sides: x + 7 = 21
2. Subtract 7 on both sides: x = 14