laurenyoungblood23 laurenyoungblood23

01-11-2019
Mathematics

contestada

13) -3x - 4y = 8
-4x - 3y=6

Respuesta :

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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