bantu tolong jawab ya .tolong banget

9. d 10. b
11. a 12. c
13. d

Soal No. 9
[tex]f(x) = \frac{2}{3}(x -1) + 5 \\ \\ f(7)= \frac{2}{3}(7 - 1) + 5 \\ \\ f(7)= \frac{2}{3}(6) + 5 \\ \\ f(7)=4+5 \\ f(7)=9...............Jawaban(D) [/tex]

Soal No 10
f(x) = x - 1
   f(1) = 1 - 1 = 0.........memenuhi
   f(2) = 2 - 1 = 1.........TIDAK memenuhi

f(x) = x² - 1
   f(1) = 1² - 1 = 1 - 1 = 0......memenuhi
   f(2) = 2² - 1 = 4 - 1 = 3......memenuhi
   f(3) = 3² - 1 = 9 - 1 = 8 .....memenuhi

f(x) = 2x -1
  f(1) = 2(1) - 1 = 2 - 1 = 1.....TIDAK memenuhi

f(x) = 3x - 1
  f(1) = 3(1) - 1 = 3 - 1 = 2 ....TIDAK memenuhi

Jadi Jawaban yang tepat adalah Jawaban (B)

Soal No. 11
f(x) = 2x - 7

f(a) = 11
f(a) = 2a - 7
11 = 2a - 7
2a = 11 + 7
2a = 18
a = [tex] \frac{18}{2} [/tex]
a = 9 ..................Jawaban (A)

Soal No. 12
[tex]q(x) = \frac{mx-3}{x+11} \\ \\ q(2) = 1 \\ \\ m=?[/tex]
[tex]q(2) \to \frac{2m-3}{2+11}=1 \\ \\ \frac{2m - 3}{13}=1 \\ \\ 2m-3=13 \\ 2m=13+3 \\ 2m=16 \\ m= \frac{16}{2} \\ m=8..............Jawaban(C) [/tex]

Soal No. 13
h(x) = 5x - m
Jika h(1) = 8, maka :
5(1) - m = 8
5 - m = 8
- m = 8 - 5
- m = 3
m = - 3

h(2) = 5(2) - (-3)
h(2) = 10 + 3
h(2) = 13 ..................Jawaban (D)