Respuesta :

bekkarmahdi702

Step-by-step explanation:

  • The first one :

-2× [A1] + [A2]

-2* [A1]+[A2]: 12x -4y-7x+5y = -12 -9 ⇒ 5x+y = -21

this gives us system B

  • The second one :

-2*[B2]+[B1] :

  • -2(5x+y= -21) + (-6x+2y=6)
  • (-10x-2y = 42) + (-6x +2y = 6)
  • add them together :  -16x = 48

wegnerkolmp2741o

Answer:

-2 * A2 + A 1 = B2

-2 *B2   + B1 = C1

Step-by-step explanation:

-6x +2y = 6

-7x +5y = -9

We want to end up with 5x+ y = -21

Multiply the A2 by -2

-2 (-6x +2y) = 6*-2

12x -4y = -12

And add this to the A2

12x -4y = -12

-7x +5y = -9

-----------------------

5x + y = -21

Take this equation and multiply by -2

-2(5x + y) = -21*-2

-10x -2y = 42

Add this to equation B1

-10x -2y = 42

-6x +2y = 6

-------------------

-16x + 0y = 48  This is equation C1

B2 * -2  + B1 = C1

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