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x | 1 | 2 | 3 | 4 |
y | 4,5 | 4 | 3,5 | 3 |
2x - y = 5 titik potong: (4,3)
x | 1 | 2 | 3 | 4 |
y | -3 | -1 | 1 | 3 |