Bantu cari cara nya dong

f(x) = ax + b

f(1) = -1
= a(1) + b = -1 = a + b = -1 ... (persamaan 1)

f(3) = 5
= a(3) + b = 5 = 3a + b = 5... (persamaan 2)

pers 1 = a + b = -1
pers 2 = 3a + b = 5
kemudian pers 1 - pers 2
maka, -2a = -6
a= 3
maka masukkan ke
pers 1, a +b = -1
3 + b = -1
b = -4

jawaban B