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U3= a+2b =16
U11=a+10b=0 _
-8b=16 -----> b=-2
a+2b=16
a+2(-2)=16 ---------> a=20
U25=20+24(-2)=20-48=-28
U3 = a + (n-1) b
16 = a + (3-1)b
16 = a + 2b
a + 2b = 16 (Persamaan 1)
U11 = 0
U11 = a + (n-1)b
0 = a + (11 - 1) b
0 = a +10b
a + 10b = 0 (persaman 2)
eliminasi pers 1 & 2
a + 2b = 16
a + 10b = 0
-------------------- --
-8b = 16
b = -2
subtitusi nilai b ke pers 1 atau 2
a + 10b = 0
a + 10(-2) = 0
a + (-20) = 0
a = 20
dit U25?
U25 = a + (n-1)b
U25 = 20 + ( 25 - 1) (-2)
U25 = 20 + (24)(-2)
U25 = 20 - 48
U25 = -28