Here's a question ~
can anyone give the explanation ?

Answer:
Step-by-step explanation:
As per the question we have:
This can be a function with the slope of m = 1 or m = - 1 as these lines must be perpendicular to each other and make 90°/2 = 45° or 45° + 90° = 135° angle with the x- or y- axis.
So the lines could be:
Lines must be perpendicular to each other as they are cutting at y intercept -1
Slope intercept form of line
for slope -1
For slope 1
y=x-1