Bantu ya, nomor 13-15 beserta Caranya

f(6) : 6a+b = - 13
f(-2): -2a+b = 11
___________-
8a+0b = -24
8a = -24
a = -24/8 = -3
6a + b = - 13
6*-3 + b = -13
-18 + b = -13
b = -13 + 18
b = 5
fungsi (x) = ax+b
= -3x + 5 atau 5 -3x (b)

15. d