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f(1) = a + b = -1,
a + 1 - 3a = -1
-2a = -2 ⇒ a = 1
b = 1 - 3(1) = -2
=> f(3) = 3a + b = 1
=> f(1) = a + b = -1
=> 3a + b = 1
a + b = -1 -
2a = 2
a = 1
=> a + b = -1
1 + b = -1
b = -1 -1
b = -2