F(×)=a×+b,jika f(3)=6 dan f (2)=5 maka dari 2a-3b adalah

F(x)= ax + b
F(3)= 3a + b = 6
F(2)= 2a + b = 5
------------------- -
a + 0 = 1
a = 1
(2 x 1) + b = 5
2 + b = 5
b = 5-2
b = 3

2a-3b
= 2(1) - 3(3)
= 2-9
= -7