In order for something to be a function, it cannot have an x-value repeated. Therefore, (1,0) cannot be a possible ordered pair because the function already has a point at x=1 (1,2).
Answer:
Each factory should supply 100 units
x = 100 units
y = 100 units
Step-by-step explanation:
Since the total production must be 200 units, then x + y = 200.
The cost function can be rewritten as a function of 'x' as follows:

The value of 'x' for which the derivate of the cost function is zero, is the production level that minimizes cost:

In order to minimize production costs, each factory should supply 100 units
P parentheses
E exponents
M multiplication
D division
A addition
S subtraction