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f(1) = a + b = 2
f(3) = 3a + b = 12
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-2a = -10
a = 5
f(1) = a + b = 2
f(1) = 5 + b = 2
f(1) = b = 2 - 5
f(1) = b = -3
f(x) = ax + b
f(x) = 5x - 3