mohon dijawab yang D saja dan dicara y dan x nya

5x - 4y = 8 |×3
- 3x + 3y = - 3 |×4

15x - 12y = 24
- 12x + 12y = - 12
-------------------------(+)
3x = - 12
x = - 4

5x - 4y = 8
5(-4) - 4y = 8
(-20) - 4y = 8
- 4y = 8 + 20
- 4y = 28
y = - 7

5x = 4y + 8
3y = 3x - 3

5x - 4y = 8 | x3
- 3x + 3y = - 3 | x4

15x - 12y = 24
-12x + 12y = -12 (eleminasi)

3x = 12
x = 12 ÷ 3
x = 4

5x - 4y = 8
(5 x 4) - 4y = 8
20 - 4y = 8
- 4y = 20-8
- 4y = 12
y = 12 ÷ -4
y = -3

x = 4
y = -3