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h(5)= 5a + b = 16.....(1)
h(4)= 4a + b = 11.....(2)
pers. 1 dan 2 dieleminasi, maka akan dihasilkan :
a= 5
(1).... 5a +b = 16
b= 16 - 5a = 16 - (5×5) =16 - 25 = -9
jadi h(-1) = 5 × (-1) + (-9).= -14
pers 1
h(5) = 5a + b
16 = 5a + b
pers. 2
h(4) = 4a + b
11 = 4a + b
eliminasi :
16 = 5a + b
11 = 4a + b -
5 = a
substitusi :
16 = 5a + b
16 = 5.5 + b
b = -9
maka persamaan menjadi ;
h(x) = 5x - 9
h(-1) = 5.-1 - 9
h(-1) = -14