2x - 3y = -18 dan 4x + y = -8 nilai x dan y yang memenuhi sistem persamaan linear tersebut adalah?

Mapel : Matematika
Bab : SPLDV

4x + y = -8
        y = -4x - 8

           2x - 3y = -18
2x - 3(-4x - 8) = -18
2x + 12x + 24 = -18
                14x = -18 - 24
                14x = -42
                    x = -42/14
                    x = -3

y = -4x - 8
y = -4(-3) - 8
y = 12 - 8
y = 4

HP = { -3, 4 }

2x - 3y = - 18
4x + y = - 8 |×3
maka
2x - 3y = - 18
12x + 3y = - 24
----------------------(+)
14x = - 42
x = - 42/14
x = - 3

subtitusi
2x - 3y = - 18
2(-3) - 3y = - 18
- 6 - 3y = - 18
- 3y = - 18 + 6
- 3y = - 12
y = 4

hp = ( - 3 , 4 )