You are here:
- Home
- Science
- Mathematics
- Advanced Math
- Simultaneous Equations
Advanced Math/Simultaneous Equations
Advertisement
Question
I have the following four equations, and need to solve for the four unknowns. Reduced row echelon form does not provide a valid response.
a + c = 25
a + d = 35
b + c = 35
b + d = 45
Kane~
You can't find a solution for the 4 unknowns because this is a dependent system. Row 2 and Row 4 become the same so there are only 3 independent variables and the solution is:
a+d = 35
b+d = 45
c-d = -10
and d can be anything you please
Math Prof
- Add to this Answer
- Ask a Question
Questioner's Rating
| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | Thanks for the help. This was an empirical model, so I still need to find a way to make it an independent system so that it can be solved. | ||
Related Articles
Advanced Math
Answers by Expert:
Sherry Wallin
Expertise
I can answer most questions up through Calculus and some in Number Theory and Abstract Algebra.
Experience
I have had my Bachelor's Degree since 1987 and have been a teacher since 1988. I earned my Masters Degree in Mathematics May 2010. I have been teaching at the same community college since 2002.
Education/Credentials
I have taught 12 years at the community college level, medical college, and technical college as well as a high school instructor and alternative education instructor and charter school instructor.
Awards and Honors
Master's GPA 3.56
Bachelor's GPA 3.34
Post grad work not degree related GPA 4.0
©2012 About.com, a part of The New York Times Company. All rights reserved.