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Question

px+qy=p+q and qx-py=q-p by substitution method

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Solution

px+qy=p+q....(i)qx-py=q-p....(ii)from(i)x=p+q-qypputting in (ii)qp+q-qyp-py=q-ppq+q2-q2y-p2yp=q-ppq+q2-q2y-p2y=pq-p2q2+p2=yq2+p2y=1putting in (i)x=1 Ans

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