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You've given us two equations and asked for an answer.
What you haven't given us is a question.
Answer:
The loss on the sale of 50 type M cars is $8000, and the loss is decreasing at the rate of $500 per 50 type M car sold.
Step-by-step explanation:
Given


Required
Interpret
From the question, we understand that:
Number of cars
Profit on x cars
Using the above as a point of reference,
Rate of loss per x cars
So, the interpretations are:

A loss of 8000 on 50 cars

The loss rate is a reduction of 500 per 50 car
Combine all the x's so
6x+5x+4 (2x)
11x+8x
19x
In general when a firm produces nothing it still has to pay for the fixed costs while the variable costs are zero