tentukan range fungsinya jika daerah asalnya {1,2,3,4,5,6,7,8,9} dan rumus fungsinya f(x)=3x-1

f(x)= 3x-1
f(1) = 3(1)-1 = 3-1 = 2
f(2)=3(2)-1=6-1=5
f(3)=3(3)-1=9-1=8
f(4)=3(4)-1=12-1=11
f(5)=3(5)-1=15-1=14
f(6)=3(6)-1=18-1=17
f(7)=3(7)-1=21-1=20
f(8)=3(8)-1=24-1=23
f(9)=3(9)-1=27-1=26