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3a+b=4
a. 3a+1-2a=4
a=4-1
a=3 b=1-2a
b=1-6
b=-5
b. pers f(x)=3x-5
c. f(3)=4
F(3)=4 -> 3a+b=4 (1)
F(2)=1 -> 2a+b=1 (2) (di kurang)
Jadi a=3
(1) 3a+b=4
3(3)+b=4
b=9-4=5
B. 3x+5
C. F(x)=ax+b
F(3)=3(3)+5=9+5=14
Sorry kalo salah