What is the total flow (loads per week) between department y and department z?

A company needs to locate three departments (X, Y, and Z) in the three areas (I, II, and III) of a new facility. They want to minimize interdepartmental transportation costs, which are expected to be $.50 per load per meter moved. An analyst has prepared the following distances and flow matrices:

Distances (meters):
From/TO I II III
I - 10 20
II - 10
III - 

Flows (loads per week:
From/TO I II III
X - 60 90
Y 40 - 160
Z 110 140 - 

What is the total flow (loads per week) between department Y and department Z? 
E. 300

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)