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a = 23 - 6b
U3 + U4 = 25
a + 2b + a + 3b = 25
2a + 5b = 25
2.(23 - 6b) + 5b = 25
46 - 12b + 5b = 25
46 - 7b = 25
- 7b = 25 - 46
- 7b = -21
b =
b = 3
a = 23 - 6b
a = 23 - 6.(3)
a = 23 - 18
a = 5
U11 = a + 10.b
= 5 + 10 . 3
= 5 + 30
= 35
u₁₁= u₁ + (n - 1).b
= 5 + (11 - 1). 3
= 5 + 30
= 35