Jika Daerah asal { 3,6,9,12,15} maka daerah hasil fungsi f : → 2/3 x -9 adalah

x=3, f= 2/3 (3) - 9 = -7
x=6, f=2/3 (6) - 9 = -5
x=9, f= 2/3 (9) - 9 = -3
x=12, f= 2/3 (12) - 9 = -1
x=15, f= 2/3 (15) - 9 = 1
jawaban nya adalah C

x = {3 , 6 , 9 , 12 , 15}
f : -> 2/3 x - 9

f(x) = 2/3 x - 9

f(3) = 2/3 (3) - 9
f(3) = 2 - 9
f(3) = -7

f(6) = 2/3 (6) - 9
f(6) = 4 - 9
f(6) = -5

f(9) = 2/3 (9) - 9
f(9) = 6 - 9
f(9) = -3

f(12) = 2/3 (12) - 9
f(12) = 8 - 9
f(12) = -1

f(15) = 2/3 (15) - 9
f(15) = 10 - 9
f(15) = 1

Jadi daerah hasilnya adalah {-7 , -5 , -3 , -1 , 1} (C)