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a+2b=11....(1)
U6=23
a+5b=23....(2)
elminasi a dri pers 1&2
a+2b=11
a+5b=23
--------------- -
-3b= -12
b=4
a+2b= 11
a+2(4)=11
a= 11-8
a=3
s70= n/2(2a+69b)
=70/2(2.3+69.4)
=35(6+73)
=35(79)
=2765