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Verified answer
Diketahui :Un = an + b
U11 = 11a +b = 52
U13 = 13a + b = 63
--------------------- (-)
2a = 11
a = 11/2
subtitusi nilai a
11a +b = 52
11(11/2) +b = 52
b = 52 - 121/2
b = 104/2 - 121/2
b = -17/2
maka a + b
= 11/2 - 17/2
= -6/2
= -3