1. diketahui fungsi f (x) = a×+b jika f (1)= 5 f (-4) = 1 tentuka : a. rumus fungsi yang baru
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Jawaban:
f(x) = ax + b
f(1) = a + b = 5
f(-4) = -4a + b = 1
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5a = 4
a = 4/5
a + b = 5
4/5 + b = 5
b = 5 - 4/5
b = 21/5
f(x) = (4/5)x + 21/5
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