Jawabanmu

2014-06-04T18:49:08+07:00
F(4)=11, f(-2)=-13
f(4)=4a+b
f(-2)=-2a+b
4a+b=11... (i)
-2a+b=-13.... (ii)
(i)-(ii), 6a=24
a=4
sub a ke (i)
4.4+b=11
b=-5
f(x)=4a-5
f(6)=4.6-5=19