Jawaban:
– 2x + 2
Penjelasan dengan langkah-langkah:
(2, –2) → f(2) = 2a + b = –2 . . . persamaan (1)
(–2, 6) → f(–2) = – 2a + b = 6 . . . persamaan (2)
Eliminasi persamaan (1) dan persamaan (2)
2a + b = –2
– 2a + b = 6
____________ (-)
4a = –8
a = - \frac{8}{4}a=−
4
8
a = –2
Substitusi a = 2 pada persamaan (1)
2(–2) + b = –2
– 4 + b = –2
b = – 2 + 4
b = 2
Diperoleh: f(x) = ax + b → f(x) = – 2x + 2
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Jawaban:
– 2x + 2
Penjelasan dengan langkah-langkah:
(2, –2) → f(2) = 2a + b = –2 . . . persamaan (1)
(–2, 6) → f(–2) = – 2a + b = 6 . . . persamaan (2)
Eliminasi persamaan (1) dan persamaan (2)
2a + b = –2
– 2a + b = 6
____________ (-)
4a = –8
a = - \frac{8}{4}a=−
4
8
a = –2
Substitusi a = 2 pada persamaan (1)
2a + b = –2
2(–2) + b = –2
– 4 + b = –2
b = – 2 + 4
b = 2
Diperoleh: f(x) = ax + b → f(x) = – 2x + 2