tolong di jwb dong no.4 dan 5.penting bgt

4.a) f(x)=ax+b
       f(3)=13
       f(1)=-1
F3=3a+b=13
F1=a+b=-1
------------------------- - dieliminasi
2a=14
a=7
maka b= -15



 b) rumus fungsinya F(x) = 7x-15

2. a) F(x)= 2x+y

domain= { -3,-2,-1,0,1,2}
kodomain=
F(-3)=-6+y
f(-2)= -4+y
f(-1)=-2+y
f(0)=y
f(1)=2+y
f(2)= 4+y

b.(tidak valid)