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Verified answer
Mapel : MatematikaBab : barisan dan deret
U4 + U6 = 28
a + 3b + a + 5b = 28
2a + 8b = 28
U7 + U10 = 42
a + 6b + a + 9b = 42
2a + 15b = 42
Eliminasi :
2a + 8b = 28
2a + 15b = 42
___________ _
-7b = -14
b = -14/-7
b = 2
2a + 8b = 28
2a + 8(2) = 28
2a + 16 = 28
2a = 28 - 16
2a = 12
a = 6
U15 = a + 14b
U15 = 6 + 14(2)
U15 = 6 + 28
U15 = 34
Jadi
a = 6
b = 2
U15 = 34