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f(-1) = 1 artinya x=-1 f(x) =1
f(x) = mx+n
Persamaan 1 -> 4= m.0 + n
4= n
Persamaan 2 -> 1= m.-1 +n
1= -m+n
Substitusikan 1&2
1= -m+4
-3= -m
3=m dan 4=n
nilai f(-3)
f(-3)= 3.-3 + 4
= -9 +4
= -5