Question

Fungsi h (x) = ax + b jika h (-5 ) = -17 dan h (2) = 11 maka a - b =

Answer 1

Diketahui:
h(x) = ax + b
h(-5) => -5a + b = -17
h(2) => 2a + b = 11

Ditanya:
a-b= ...?

Jawab :

-5a + b = -17
2a + b = 11
Eliminasi huruf b nya agar lebih mudah
-7a = -28
a = 4

subtitusikan yang sudah diketahui a = 4
2a + b = 11
2.4 + b = 11
8 + b = 11
b = 11 - 8
b = 3

Jadi a - b = 4 - 3 = 1

Answer 2

h(-5) = -17
-5a + b = -17 ... [ pers. 1 ]

h(2) = 11
2a + b = 11 ... [ pers. 2 ]

Didapat :
a = 4
b = 3

a - b = 4 - 3 = 1