fungsi f didefinisikan dengan f(x)=ax+b jika f(3)=5 dan f(-2)=-5 maka nilai f(7)

F(X) = ax + b
F(3) = a(3) + b
5 = 3a+b
F(-2) = a(-2)+b
-5 = -2a+b
3a+b = 5
-2a+b = -5
--------------- (-)
5a = 10
a = 2
3(2)+b = 5
6+b=5
b = 5-6
b = -1
F(7) = 2(7)+(-1)
= 14-1
= 13