The equations \( x-y=4 \) and \( x^{2}+4 x y+y^{2}=0 \) represent t...

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The equations \( x-y=4 \) and \( x^{2}+4 x y+y^{2}=0 \) represent the
P sides of

W
(1) an equilateral triangle
(2) a right-angled triangle
(3) an isosceles triangle
(4) none of these
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