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The three lines x-y+1=0 ,2x+y-4=0 ,and x+y+5=0 intersect to form a triangle. Find the coordinates of the vertices of the triangle.

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x-y+1=0 ,2x+y-4=0 meet at (1,2)
2x+y-4=0 , x+y+5=0 meet at (9,-14)
x-y+1=0 , x+y+5=0 meet at (-3,-2)

ta-da!

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