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y = -(-2)² -6(-2)+3
= -4+12+3
= 11
titik (-2,11)
m = y'
= -2x-6
= -2(-2)-6
= 4-6
= -2
y - y₁ = m (x- x₁)
y - 11 = -2 (x + 2)
= -2x-4
2x+y-11+4 = 0
2x+y-7 = 0