Answer:
The lines are parallel.
Step-by-step explanation:
The first line is [tex]x-y=1[/tex]
In slope-intercept form, this line has equation: [tex]y=x-1[/tex]
The second line is [tex]y-x=1[/tex]
In slope-intercept form, the line has equation: [tex]y=x+1[/tex]
The slopes of the two lines are the same (m=1)
however, the y-intercepts of these lines are different (-1) and (+1) respectively.
The first choice is correct.
The two lines are parallel and hence will never intersect.
