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Q.

By translating the axes the equation xyx+2y=6  has changed to  xy=c, then  c=

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a

7

b

6

c

4

d

5

answer is A.

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Detailed Solution

x=X+h,y=Y+k
The transformed equation of  xyx+2y=6 is X+hY+kX+h+2Y+k6=0
XY+k1X+h+2Y+hkh+2k6=0Comparing this equation with xy=c we get  k1=0,h+2=0&c=hkh+2k6 k=1,h=2&c=21+2+26=4

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By translating the axes the equation xy−x+2y=6  has changed to  xy=c, then  c=