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If 2x + 3 + i(y - 1) = 7 + 5i with real x and y, find x + y.
A7
B6
C10
D8
Answer & Solution
Correct answer: D. 8
Real parts give 2x + 3 = 7 so x = 2, imaginary parts give y - 1 = 5 so y = 6, hence x + y = 8.
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