Find the envelope of the family of lines \(\frac{x}{t} \) + yt = 2c, t being the parameter.

Find the envelope of the family of lines \(\frac{x}{t} \) + yt = 2c,

1.	Find the envelope of the family of lines \(\frac{x}{t} \) + yt = 2c, t being the parameter.
A.	xy = c
B.	xy = 2c
C.	xy = 2
D.	xy = c2
Answer» E.