What is the angle between the lines \[x+y=1\]and \[x-y=1?\]

1.	What is the angle between the lines \[x+y=1\]and \[x-y=1?\]
A.	\[\frac{\pi }{6}\]
B.	\[\frac{\pi }{4}\]
C.	\[\frac{\pi }{3}\]
D.	\[\frac{\pi }{2}\]
Answer» E.

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What is the angle between the lines \[x+y=1\]and \[x-y=1?\]

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