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u4 => a + 3b = 15 _ eliminasika
8b = 32
b = 32/8
b = 4
subtitusikan
a + 3b = 15
a + 3(4) =15
a + 12 = 15
a = 15 -12
a = 3
jumlah suku ke 10
Sn = n/2( 2a + (n-1)b)
S10= 10/2( 2x3 + ( 10-1) 4)
= 5 ( 6 + 36 )
= 5 ( 42 )
= 210
jwabannya 210