Minta bantuannya nomer 4 A dan 4 B

A. -a+b=-8
a+b=-6
______ –
-2a = -2
a= 1

1+b=-6
b= -6-1
b=-7

B. f(2)= ax+b = 2.1+(-7)= -5

f(3)= 3.1+(-7)=-4

nilai= -5+-4=-9