if 2xsquare +7xy+ 3ysquare -3ysquare -4x+3y+ lambda represent a pair of strainghtline
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- 2x2 =(2x + 2x)=4x
- 7xy=7xy
- 3y^2=(3y + 3y )=6y
- -3y^2=(-3y + -3y)
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