Sebuah bentuk fungsi g(x) = ax + b, jika nilai g(4) = 5 dan g(-7) = -17, maka bentuk fungsi rumus g(x) adalah ...
g(x) = ax + b
g(4) = 5
g(-7) = -17
g(4) = a(4) + b
= 4a + b ==> Persamaan 1
g(-7) = a(-7) + b
= -7a + b ==> Persamaan 2
Eliminasi Pers. 1 dan Pers. 2
4a + b = 5
-7a + b = -17
-----------------(-)
11a = 22
a = 22/11
a = 2
Substitusi
4a + b = 5
4(2) + b = 5
8 + b = 5
b = 5 - 8
b = -3
maka g(x) = 2x - 3
g(x) = 2x - 3
Penjelasan dengan langkah-langkah:
g(x) = ax + b
g(4)= 5
5 = 4a + b
4a + b = 5 --- persamaan 1
g(-7) = -17
-17 = -7a + b
-7a + b = -17 --- persamaan 2
KITA PAKAI CARA ELIMINASI SUBTITUSI
4a + b = 5
-7a + b = -17
__________ (-)
11a = 22
a = 2
SUBTITUSI NILAI a
4a + b = 5
4.(2) + b = 5
8 + b = 5
b = -3
g(x) = 2x - 3
semoga membantu
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