f(x) = ax+b f(5) = 13 f(-2) = -8 f(3) = ?

f(5)= a× 5+b = (13= 5a+b)
f(-2)= a×-2+b. = (-8=-2a+b)dikurangi
= 21 = 7 a
a = 21 : 7
a = 3
nilai b = -8 = 3×-2+b
-8 = -6+b
b= -6+8
b= 2
f(3)= 3×3+2
= 11
#maaf kalo kurang tepat