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f(5) = 5m+ n =23
eliminasi kedua persamaan tersebut, maka -8m=32 -> m= -4
-3m+n= 9 -> 12+n=9 -> n=-3
f(-1)-f(3)= (4-3)-(-12+3)= 1+9=10
5m+n=23
subtitusi
m=4
masukkin nilai m nya ke -3m+n=-9
dapet n=3
Ganti nilai m dan n ke fungsi f(x) awal
jawabannya -16