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x + 2y = 6
--------------- -
-y = -2
y = 2
x + y = 4
x = 4 - 2 = 2
titik potong (2,2)
jika x = o, maka :
x + y = 4
y = 4 (0,4)
x + 2y = 6
2y = 6
y = 3 (0,3)
jika y = 0, maka :
x + y = 4
x = 4 (4,0)
x + 2y = 6
x = 6 (6,0)
masukin semua ke kartesius trus titik (0,4) sama (4,0) satu garis, titik (0,3) sama (6,0) satu garis. nanti berpotongan di titik (2,2).