Aseamstress has 1/4 of a foot of thread. then she uses 1/5 of a foot of thread to sew a hole how much of the thread is left?

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c