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f(1) =a.1 +b = -1
1a +b = -1
f(2) = a.2 + b = 2
2a + b = 2
= 1a + b = -1
2a + b = 2
____________ -
-1a = -3
a = 3
= 1a + b = -1
1.3 + b = -1
3 + b = -1
b =-1-3
b = -4
f(x) = ax+b
f(12) = 3.12+ (-4)
=36 + (-4)
= 32