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Bab FungsiMatematika SMP Kelas VIII
f(x) = ax + b
f (1) = a + b = -1
f (3) = 3a + b = -7
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-2a = 6
a = -3
a + b = -1
-3 + b = -1
b = 3 - 1
b = 2
f(x) = -3x + 2