Find an equation for the set of points in an xy-plane such that the sum of the distances from 
and 
is 
. 
Definitions:
Activity-Based Costing
A costing method that assigns overhead and indirect costs to related products and services based on the activities they require.
Activity Rate
A predetermined overhead rate in activity-based costing. Each activity cost pool has its own activity rate which is used to apply overhead to products and services.
Estimated Overhead
Projected costs for running a business that does not directly tie to specific product manufacturing, such as rent, utilities, and management salaries.
Direct Labour-Hours
The total hours of work directly contributed by labor to the production of goods.
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