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y - 2 = m(x - 3)
y - 2 = mx - 3m
y = mx - 3m + 2
y = y
x² - 4x + 6 = mx - 3m + 2
x² - 4x - mx + 6 + 3m - 2 = 0
x² - (4 + m)x + 3m + 4 = 0
Syarat berpotongan adalah D > 0.
b² - 4ac > 0
(-(4 + m))² - 4(1)(3m + 4) > 0
16 + 8m + m² - 12m - 16 > 0
m² - 4m > 0
m(m - 4) > 0
m < 0 atau m > 4.