suatu fungsi f(x)=px+4.Jika f(1)=3 dan f(4)=-3 .Tentukanlah nilai a jika f(a)=-1

f(4) = 4p+4 =-3
f(1) = 1p+4 =3 -

3p = -6
p = -6/3
p = -2

f(a) = -2.x+4 = -1
-2x = -1-4
-2x = -5
x = -5/-2
x = 5/2 = 2,5