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Bab FungsiMatematika SMP Kelas VIII
f(x) = ax + b
f(2) = 2a + b = 12
f(-3) = -3a + b = -23
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5a = 35
a = 7
2a + b = 12
2 . 7 + b = 12
b = 12 - 14
b = -2
jadi, a = 7 dan b = -2
f(x) = 7x - 2