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m = 1/3
rumus persamaan garis singgung
y-y1 = m(x-x1) => masukin titik P(2,5)
(x1,y1)
y-5= 1/3(x-2)
y-5 = x/3-2/3
--------------×3
3y-15= x-2
3y= x-2+15
3y = x+13