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f (x) = ax + b
f (4) = 19
f (2) = 7
jawaban :
f (4) = a×4 + b = 4a + b .. persamaan 1
f (2) = a×2 + b = 2a + b .. persamaan 2
substitusikan :
4a + b = 19
2a + b = 7
__________ -
2a + 0 = 12
2a = 12
a = 12 : 2
a = 6
Maaf kalo salah