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Mapel : MatematikaBab : Fungsi
f(x) = ax + b
f(4) ➡ 4x + b = 6 ...(1)
f(2) ➡ 2x + b = -2 ...(2)
Carilah f(6) !
Persamaan (1) dan (2)
4x + b = 6
2x + b = -2
_________ -
2x = 8
x = 4
Cari b dari salah satu persamaan
Pakai persamaan yang (1)
4x + b = 6
4(4) + b = 6
16 + b = 6
b = -10
f(x) = ax + b
f(x) = 4x - 10
Jadi, f(6) adalah
f(6) = 4(6) - 10
f(6) = 24 - 10
f(6) = 14
Semoga membantu