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Verified answer
B (8 , 2)D (4 , 6)
maka
A (4 , 2)
C (8 , 6)
Persamaan diagonal AC
y - y1 x - x1
---------- = --------------
y2 - y1 x2 - x1
y - 2 x - 4
------- = -------
6 - 2 8 - 4
y - 2 x - 4
------ = -------
4 4
4(y - 2) = 4 (x - 4)
y - 2 = x - 4
y = x - 2