domain dan range fungsi

gambar a

perhatikan gambar

persamaan garis melalui (0,-2) dan (1,1)

gradien m = ∆y/∆x = (-2 - 1)/(0 - 1) = 3

pers garis :

y = m(x - x1) + y1

y = 3(x - 1) + 1

y = 3x - 2

y = 3

3x - 2 = 3

x = (3 + 2)/3

x = 5/3

daerah asal fungsi, Df = {x| -1 ≤ x ≤ 5/3 , x ∈ R}

daerah hasil fungsi, Rf = {y| -5 ≤ y ≤ 3 , y ∈ R}

pasangan berurutan = {(-1,-5) , (0,-2) , (1,1)}

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gambar b

y = f(x)

daerah asal (domain) fungsi :

Df = {-2, -1, 0, 1, 2, 3, 4}

daerah hasil (range fungsi) :

Rf = {-1, -1/2, 0, 1/2, 1, 3/2, 2}

pasangan berurutan :

{(-2,2) , (-1,3/2) , (0,1) , (1,1/2) , (2,0) , (3,-1/2) , (4,-1)}