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-9 = -2a + b -
----------------------
12 = 6a
2 = a
3 = 4a + b
3 = 4(2) + b
3 = 8 + b
3 - 8 = b
-5 = b
f(12) = 12a + b
= 12(2) + (-5)
= 24 - 5
= 19
f(-2) = -2a + b = -9 -
6a = 12
a = 2
f(-2) = -2a + b
-9 = -2(2) + b
-9 = -4 + b
-9 + 4 = b
-5 = b
f(12) = 12a + b
= 12(2) + (-5)
= 24 - 5
= 19