find the equation of two straight lines which are parallel to the straight line x + 7 y + 2=0 and a unit distance from the point (2, - 1)

Explanation:

General equation of line parallel to the given line x+7y+2=0 is

x+7y+c=0

This line must be unit distance from point (2,-1)

Point (2,-1) may be either side of line so we can write

So, there can be 2 line i.e.

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