Question

The system of linear equations -2x+y=8 and -3x-y=7 is graphed below. What is the solution to the system of equations? A.(–3, 2) B.(–2, 3) C.(2, –3) D.(3, 2)

Answer 1

Anabella
- 2x + y = 8                (1)
- 3x - y = 7                 (2)
Sumando (1) + ( 2)
        - 5x = 15
             x = 15/(- 5)                       x = - 3
X en (1)  [si prefieres, puedes usar (2)]
                    - 2(- 3) + y = 8
                        6 + y = 8
                        y = 8 - 6                      y = 2

                                                                            Alternativa A.