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y = 9 – 2(0) = 9 → melalui titik (0, 9)
misal → y = 0
0 = 9 – 2x
2x = 9
x = 9/2 = 4½ → melalui ttik (4½, 0)
yg pokok sudahbisa digambar, garis melalui tiik
(0, 9) dan (4½, 0)