exam Maths Puzzle Numerical Ability

Can someone please help me?

Solve the system by graphing.
x � y = 5
x + y = 3

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exam Other Question

help would be appreciated with this question, thanks.

4a-3ab-4ab+3b-6a R/(|R + j60000|) = .85

The answer for R is 105000, but I don't know how they got it.
j is imaginary number.

Thanks