Respuesta :

Space

Answer:

a = 5

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

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

Terms/Coefficients

Coordinate Planes

  • Coordinates (x, y)
  • Equations

Step-by-step explanation:

Step 1: Define

Identify.

9x - 5y = -9

(a - 1, 9)

Step 2: Solve for a

  1. Substitute in coordinate [Equation]:                                                                9(a - 1) - 5(9) = -9
  2. Evaluate [Order of Operations]:                                                                      9(a - 1) - 45 = -9
  3. [Addition Property of Equality] Add 45 on both sides:                                  9(a - 1) = 36
  4. [Division Property of Equality] Divide 9 on both sides:                                 a - 1 = 4
  5. [Addition Property of Equality] Add 1 on both sides:                                     a = 5