BCECE Engineering BCECE Engineering Solved Paper-2003

  • question_answer
    The values of \[x\] and \[y\]satisfying the equation \[\frac{(1+i)x-2i}{3+i}+\frac{(2-3i)y+i}{3-i}=i\]are:

    A) \[x=-1,y=3\]      

    B)                   \[x=3,y=-1\]                     

    C)                   \[x=0,y=1\]                       

    D)                   \[x=1,y=0\]

    Correct Answer: B

    Solution :

    \[\frac{(1+i)x-2i}{3+i}+\frac{(2-3i)y+i}{3-i}=i\] \[\Rightarrow \]               \[\frac{\left[ \begin{align}   & (3-i)(1+i)x-2i(3-i) \\  & +(3+i)(2-3i)y+(3+i)i \\ \end{align} \right]}{9+1}\] \[\Rightarrow \]\[(4+2i)x+(9-7i)y-6i-2+3i-1=10i\] \[\Rightarrow \]\[(4+2i)x+(9-7i)y-3i-3=10i\] On equating the real and imaginary parts on both sides, we get \[4x+9y-3=0\]                                    ?(i) and        \[2x-7y-3=10\] or            \[2x-7y-13=0\]                  ?(ii) On solving Eqs. (i) and (ii), we get \[x=3,y=-1\]


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