dinyataka f(x) =ax+b dengan f(4)=19 dan f(2)=7tentukan bentuk fungsi tersebut

f(x) = ax + b
..
f(4) = 4a + b = 19
f(2) = 2a + b = 7
---------------------- --
2a = 12
a = 12/2
a = 6

4a + b = 19
4(6) + b = 19
24 + b = 19
b = 19 - 24
b = - 5

f(x) = ax + b
= 6x + (-5)
= 6x - 5