If x ≠ 0 and y/x=y+x, which of the following expressions is equal to its opposite?  Choose the correct choice from the following:
A) x^2	B) x^2 – y^2	C) y^2	D) x^2 + xy - y^2	E) (x – y)^2
y/x=(y+x)/y   =&gt; y^2 = xy +x^2   =&gt; x^2 + xy - y^2+  2= 
<gadget id="calculator">+  2</gadget>
<output>2</output>
&gt; x^2 + xy - y^2= 0   Answer x^2 + xy - y^2
<result>D</result>
If x ≠ 0 and y/x=y+x, which of the following expressions is equal to its opposite?