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Verified answer
Bab Persamaan GarisMatematika SMP Kelas VIII
(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y - 2) / (4 - 2) = (x - 1) / (3 - 1)
(y - 2) / 2 = (x - 1) / 2
** 2 : 2 = 1 **
y - 2 = x - 1
y = x + 2 - 1
y = x + 1