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m = 3x² + 12x - 9 untuk x = -2
m = 3(-2)² + 12(-2) - 9
= 12 - 24 - 9
= -21
y - y1 = m(x-x1)
y - 9 = -21(x + 2)
y = - 21x - 42 + 9
y = -21x - 33