Respuesta :

Space

Answer:

C. (3, -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

7x + 3y = 12

7x - 3y = 30

Step 2: Solve for x

  1. Eliminate y:                    14x = 42
  2. Isolate x:                         x = 3

Step 3: Solve for y

  1. Substitute in x:                    7(3) + 3y = 12
  2. Multiply:                               21 + 3y = 12
  3. Isolate y term:                     3y = -9
  4. Isolate y:                              y = -3

And we have our final answer!

Otras preguntas