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S4 + S6 = 28
U9 = ?
a+b = 5
a+3b+a+5b=28
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a+b =5 x 2
2a+ 8b= 28
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2a + 2b = 10
2a+8b = 28 -
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-6b = -18
b= 3
2a + 2b = 10
2a + 2 x 3 = 10
2a = 4
a = 2
U9 = a + (n-1)b
= 2 + (9-1)3
= 2 + 24
= 26