Tolong ya dijawab pakai caranya ya..

5. f(x) = ax+b
    f(-1) = -a+b = -5
    f(2) = 2a+b = 13

-a+b = -5
2a+b =13
-3a = -18
a= 6
b= 1 (jawaban C)

6. A. domain, karena merupakan daerah asal

7. f(x)= 2x-1
    f(1) = 2-1 = 1
    f(2) = 2.2 -1 = 3
    f(3) = 2.3-1 = 5
    f(4) = 2.4-1 = 7
    f(5) = 2.5-1 = 9
             HP {1,3,5,7,9} JAWABAN C