I have solved it in elimination method if you need it in another method let me know.
Step-by-step explanation:
3x+y=21
-x-y=5
2x=26
x=13
-3×13-3y=15
y= -18
a) 0
step-by-step explanation:
i^413 x i^0 = 0 as any number multiplied by a zero is
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