Diketahi fungsi linier f (x) = ax + b. Jika f (3) = 14 dan f (5) = 20, nilai dari f(9) adalah ....
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Jawaban:
Dik = f(x) = ax +b
f(3) = 14
f(5) = 20
dit = f(9)?
jwb= (menggunakan eliminasi)
f(x) = ax + b
cari a =
14 = 3a + b
20 = 5a + b
__________ -
-6 = -2a
-6/-2 = a
3 = a
cari b
14 = 3a + b
14 = 3(3) + b
14 = 9 + b
14-9 = b
5 = b
nilai f(9)
f(x) = ax + b
f(9) = 3(9) + 5
f(9) = 27 + 5
f(9) = 32
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