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f(3) = 3a + b = 4
f(4) = 4a + b = 8
-------------- -
-a = -4
a = 4
3a + b = 4
3.4 + b = 4
12 + b = 4
b = 4 - 12
b = -8
Maka,
f(12) = 12a + b
= 12.4 + (-8)
= 48 + (-8)
f(12) = 40
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