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x.y = 0
4.4 + (-6)(-4) + (-10)b = 0
16 + 24 - 10 b = 0
40 - 10 b = 0
10 b = 40
b = 4
13) komponen x = 4i -----> 4x2 = 8i
komponen y = 3j ----> 3x2 = 6j
R = √(8i)²+(6j)²
= √64i² + 36j²
= √64 + 36
= √100
= 10