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U9 = a + 8b = 37
lalu di kurang, jadi
-5b = -20
b = -20 : -5 = 4
U4 = a + 3(4) = 17
U4 = a + 12 = 17
a = 17 - 12 = 5
jadi
U-41 = a + 40b
U-41 = 5 + 40(4)
U-41 = 5 + 160
U-41 = 165
trik mencari beda (b)
beda = nilai U9 - U4
U9 - U4
= 37 - 17
5
= 20/5
= 4
U4 = a + 3b
17 = a + 3(4)
17 = a + 12
a = 5
U41 = a + 40b
= 5 + 40(4)
= 5 + 160
= 165