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B=4
f(5)nya=
-3(5)
+4
=-11
f(2) = a(2)+b =-2 x1
f(-1)= a(-1)+b =7 x-2
2a+b = -2
2a-2b = -14 (-)
3b = 12
b = 4
a(-1)+b = 7
-a +4 = 7
-a = 7-4
-a = 3
a = -3
f(5) = a(5)+b
= -3.5+4
= -11