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Kelas 8 Matematika
Bab Fungsi

(0, 1), (1, 3), (2, 5), ...

f(x) = ax + b

f(0) = 0 + b = 1
b = 1

f(1) = a + b = 3
a + 1 = 3
a = 3 - 1
a = 2

f(x) = 2x + 1