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Q.

When the origin is shifted to the point (2, 3) the transformed equation of a curve is x2+3xy2y2+17x7y11=0. Find the original equation of the curve.

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Detailed Solution

Let (X, Y) be the new coordinates of the point (x, y), given (h, k) = (2, 3)
Given transformed equation is
X2+3XY2Y2+17X7Y11=0Now x=X+h,y=Y+kX=xh,Y=ykX=x2,Y=y3
 the original equation is 
(x2)2+3(x2)(y3)2(y3)2+17(x2)7(y3)11=0 x24x+4+3xy9x6y+182y2+12y18+17x347y+2111=0 x2+3xy2y2+4xy20=0

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When the origin is shifted to the point (2, 3) the transformed equation of a curve is x2+3xy−2y2+17x−7y−11=0. Find the original equation of the curve.