Ka tlg bantu aku ya pertanyaan ini Terima kasih :^)

jawaban soal a :
f(x) = ax + b
f(3) = a(3) + b = 11 <-> 3a + b = 11
f(1) = a(1) + b = 7 <-> a + b = 7

3a + b = 11
a + b = 7
_________-
2a = 6
a = 3

substitusikan a = 3 dalam persamaan 3a + b = 11.
3a + b = 11
3(3) + b = 11
9 + b = 11
b = 2

soal b :
rumus fungsi f(x) = ax + b
3x + 2

soal c :
f(-3) = 3(-3) + 2 = -7

soal d :
f(x) = 15
3x + 2 = 15
3x = 15-2
3x = 13
x = 13/3

Jawaban c
F(x) = 2x+5
F(-3)=2(-3)+5
=-6+5
=-1