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To find: the cost of a transformer, the cost per foot of wire, and the cost of a light
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Answer to Problem 15PS
Cost of a transformer: $10
Cost per foot of wire: $0.2
Cost of a light: $1
Explanation of Solution
Let the cost of a transformer be $ x , the cost per foot of wire be $ y , and the cost of a light be $ z .
The given data can be represented as a system of linear equations as shown below:
First find the coefficient matrix of this system,
Determinant of the coefficient matrix A is:
Since
Consider,
Now determine x ,
Now determine y ,
Now determine z ,
So, the cost of a transformer, the cost per foot of wire, and the cost of a light are:
Cost of a transformer: $10
Cost per foot of wire: $0.2
Cost of a light: $1
Chapter 8 Solutions
EBK PRECALCULUS W/LIMITS
- Calculus: Early TranscendentalsCalculusISBN:9781285741550Author:James StewartPublisher:Cengage LearningThomas' Calculus (14th Edition)CalculusISBN:9780134438986Author:Joel R. Hass, Christopher E. Heil, Maurice D. WeirPublisher:PEARSONCalculus: Early Transcendentals (3rd Edition)CalculusISBN:9780134763644Author:William L. Briggs, Lyle Cochran, Bernard Gillett, Eric SchulzPublisher:PEARSON
- Calculus: Early TranscendentalsCalculusISBN:9781319050740Author:Jon Rogawski, Colin Adams, Robert FranzosaPublisher:W. H. FreemanCalculus: Early Transcendental FunctionsCalculusISBN:9781337552516Author:Ron Larson, Bruce H. EdwardsPublisher:Cengage Learning
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