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= 2a+8b
= 46
U10 = a+9b = 48
2a+8b= 46
a+9b= 48
•••
2a+8b= 46
2a+18b= 96
•••
-10b = -50
b= -50÷-10
b= 5
substitusikan nilai b
a+9(5) = 48
a+45 = 48
a= 48-45
a= 3
•••
S30 = 30/2 (2a+(n-1)b)
= 15(2.3+(30-1)5)
= 15 . (6+29.5)
= 15 . (6+145)
= 15 . 151
= 2265