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f(-2) = -2a+b = -1 (persamaan ke-1)
f(-1) = -a+b = 2 ⇔ b = a+2 (persamaan ke-2) substitusikan ke pers. ke-1
-2a+b = -1
-2a+(a+2) = -1
-a=-3
a=3
b=a+2
b=3+2 = 5
jadi, a=3. b=5