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a+4b+a+7b = -48
2a + 11b = -48
2a + (11 x -8) = -48
2a - 88 = -48
2a -88 + 88 = -48 + 88
2a = 40
a = 40/2
a = 20
U9 = a +(9-1)b
U9 = 20 + ( 8 x -8)
U9 = 20 + -64
U9 = 20-64
U9 = -44