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cari gradien (dy/dx) di titik (9,2):
0 = 4x² - y² - 40x - 4y + 48
0 = (8x - 40) dx - (2y + 4) dy
dy/dx = (8x - 40)/(2y + 4)
= (8.(9) - 40)/(2(2) + 4)
= 32/8
= 4
pers garis singgung:
y-y₁ = m.(x-x₁)
y-2 = 4.(x-9)
y = 4x - 34