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a+4b=-6
U2+U10=-16
a+b+a+9b=-16
2a+10b=-16
a+4b=-6 (×2) 2a+8b=-12
2a+10b=-16 (×1) 2a+10b=-16
dikurangi dan hasilnya
-2b=4
b=-2
2a+8b=-12
2a-16=-12
2a=4
a=2
U31=2+(31-1)-2
U31=2+30×-2
U31=2-60
U31=-58
smoga membantu :)