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Bab FungsiMatematika SMP Kelas VIII
1] f(x) = ax + b
f (4) = 4a + b = 5
f(-2) = -2a + b = -7
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6a = 12
a = 2
4a + b = 5
4 . 2 + b = 5
8 + b = 5
b = 5 - 8
b = -3
jadi, a = 2 dan b = -3
b] persamaan fungsi
f(x) = 2x - 3