diketahui fungsi linear g (x) = ax+b jika g(1) =2 dan g (2) = 1 tentukanlah g (5)....

g(x) = ax+b
g(1) = a+ b = 2
g(2) = 2a + b = 1


2a + b = 1
a. + b = 2
—————— -
a = -1

subs nilai a
2(-1) + b = 1
b = 1+ 2 = 3



g(5) = 5(-1) + 3 = -5 +3 = -2