jawaban dan caranya

jawaban C.  f(x)= 2/3 x + 2

perhatikan gambar
(x1,y1) = (0,2)
(x2,y2) = (3,4)

(y-y1)/(x-x1) = (y2-y1)/(x2-x1)
(y-2)/(x-0) = (4-2)/(3-0)
(y-2)/x = 2/3
y-2 = 2/3 x
y = 2/3 x + 2
f(x) = 2/3 x + 2