Respuesta :

Space

Answer:

(0, -3)

General Formulas and Concepts:

Pre-Algebra

  • Order of Operations: BPEMDAS
  • Equality Properties

Algebra I

  • Solving systems of equations using substitution/elimination

Step-by-step explanation:

Step 1: Define systems

x - 4y = 12

x - 5y = 15

Step 2: Solve for y

Elimination

  1. Subtract 2 equations:                    y = -3

Step 3: Solve for x

  1. Define original equation:                    x - 4y = 12
  2. Substitute in y:                                     x - 4(-3) = 12
  3. Multiply:                                                x + 12 = 12
  4. Subtract 12 on both sides:                  x = 0

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