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y' = m untuk x = 1 -> 8(1) - 1 = 7
persamaan garis melalui titik dan bergradrien m :
y-b=m(x-a)
y-2=7(x-1)
y-2=7x-7
7x-y-5 = 0
masukin x=1
maka m = 8-1=7
pers garis A(1,2) yg sejajar dengan garris singgung kurva
berarti m1 = m2
y-2=7(x-1)
y = 7x-7+2
y = 7x-5