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m = y' = 6x - 3x² = 3
3x² - 6x + 3 = 0
3(x² - 2x + 1) = 0
x = 1 maka y = 2
PGS:
y - 2 = 3(x - 1)
y - 2 = 3x - 3
y = 3x - 1