Metode eliminasi dan grafik penyelesaian SPLDV x-y=4 2x+4y=20

Metode eliminasi:
2x + 4y = 20 (×1)
x - y = 4 (×2)
2x + 4y = 20 -
2x - 2y = 8
0 + 2y = 12
y = 12/2
y = 6

2x + 4y = 20
2x + 4(6) = 20
2x + 24 = 20
2x = 20 - 24
x = -4/2
x = -2