The midpoint of AB is M(1,-3).If the coordinates of A are (4,-7), what are the
coordinates of B?

do u have a picture

Step-by-step explanation:

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

the answer is 13 cm