Fungsi f(x)= ax + b , jika f(2) = -2 dan f(-3) = 13 maka nilai f(4) adalah Tolong jawabannya ya...

berarti pake cara eliminasi kan..
2a +b= -2
-3a+b= 13
-------------- -
5a      = -15
a= -3

2*(-3)+b= -2
b= -2+6
b= 4

f(4)= -3*(4)+4
     = -12+4
     = -8

jadi hasilnya -8
sori kalo salah :)

f(x)= ax+b

f(2)= a(2)+b = -2
= 2a + b = -2
f(-3)= a(-3)+b = 13
= -3a + b = 13

2a + b = -2
-3a+ b = 13
___________ _
5a = -15
a = -15/5
a = -3

2a+b = -2
2(-3)+b=-2
-6 +b = -2
b= -2 + 6
b= 4

f(x)= ax+b
f(4)= -3(4)+4
= -12 + 4
= -8