If x + y varies directly with x - y, then which one of the following i

1.	If x + y varies directly with x - y, then which one of the following is true?
A.	x and y vary directly
B.	\[{{x}^{2}}+\text{ }{{y}^{2}}\] and \[{{x}^{2}}-\text{ }{{y}^{2}}\] vary directly
C.	Both A and B
D.	\[{{x}^{2}}+\text{ }{{y}^{2}}\] and \[{{x}^{2}}-\text{ }{{y}^{2}}\] vary indirectly
E.	None of these
Answer» D. \[{{x}^{2}}+\text{ }{{y}^{2}}\] and \[{{x}^{2}}-\text{ }{{y}^{2}}\] vary indirectly

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If x + y varies directly with x - y, then which one of the following is true?

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