laurenyoungblood23 laurenyoungblood23
  • 01-11-2019
  • Mathematics
contestada

13) -3x - 4y = 8
-4x - 3y=6​

Respuesta :

nguyenminhnguyet82
nguyenminhnguyet82 nguyenminhnguyet82
  • 01-11-2019

Answer:

x = 0, y = -2

Step-by-step explanation:

-3x - 4y = 8  (1)

-4x - 3y=6​ (2)

Multiply (1) by -4 and (2) by -3, we have:

12x + 16y = - 32  (3)

12x + 9y= -18​ (4)

Subtract (4) from (3), we have:

(12x + 16y) - (12x + 9y) = - 32  - (-18)

<=> 7y = - 14

=> y = - 2

Replace y with - 2 in (3), we have x = 0

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