Answer:
Mid-point: 
Equation: 
Step-by-step explanation:
To find the mid-point of AB, simply add up their x and y coordinates and divide by 2 respectively to find their middle point.



To find the perpendicular slope that passes through the mid-point, we need to know the slope between AB first.
Slope of AB:
=
=
= 
Multiplying slopes that are perpendicular with each other always results in -1.


By the point slope form:

Plug in the coordinates of the mid-point:

Equation: 
21 = x + 6x
Solve that in order to answer your problem.
There is not enough information there can be 3 probable outcome
Easy peasy!
By the time you hear the word times like "eight times" in the problem, you should know that you need to do some multiplying.
What you do is:
1/4 x 8/1 (multiply across; ex: numerator x numerator; deominator x deominator)
By the time you multiply that you get 8/4
Then SIMPLIFY- by dividing 8 by 4 that gets you 2