Jawabanmu

2014-03-09T20:18:45+07:00
F(x) = ax + b

f(1)= a1 + b = -2
f(4)=a4  +b  = 19
_______________ _
       -3a   =  -21
          a   =   -21/-3
           a   = 7
1 3 1
2014-03-09T20:21:28+07:00
F(1)= a+b = -2 f(2)= 4a+b = 19 ________________ - -3a = -21 a = -21/-3 a = 7