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cluponka [151]
3 years ago
10

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

Mathematics
1 answer:
Lena [83]3 years ago
3 0

Answer:

x = 14

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Algebra I</u>

  • Equality Properties

<u>Geometry</u>

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

Step-by-step explanation:

<u>Step 1: Define</u>

3(x + 7)° = 63°

3(x + 7)° + 63° + y° = 180°

<u>Step 2: Solve for </u><em><u>x</u></em>

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