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y = 3x - 8
-------------------------- -
0 = x² - 6x + 8
0 = (x - 2) (x - 4)
x - 2 = 0 atau x - 4 = 0
x = 2 atau x = 4
untuk x = 2 ⇒ y = 3x - 8
y = 3.(2) - 8
y = 6 - 8
y = - 2 ⇒ titik potong (2 , - 2)
untuk x = 4 ⇒ y = 3.(4) - 8
y = 12 - 8
y = 4 ⇒titik potong (4 , 4)