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garis : x + 8y - 7 = 0
m1 = =
tegak lurus m1.m2 = -1
.m2 = -1
m2 = 8 = y'
y' = 6x - 4
8 = 6x - 4
x = 2
y = 3x² - 4x + 1
y = 3.2² - 4.2 + 1 = 5
persamaan garis singgung :
y - y1 = m(x - x1)
y - 5 = 8(x - 2)
y - 5 = 8x - 16
y = 8x - 11