You are here:
- Home
- Science
- Mathematics
- Advanced Math
- When using Cramer's Rule to...
Advanced Math/When using Cramer's Rule to...
Advertisement
Question
When using Cramer's Rule to solve the system of equations
containing 2x-y=1, -4x+3y=0 the numerator for the y variable
looks like what determinant?
2x - y = 1
-4x + 3y = 0
|2,-1|
|-4,3|
D = ad - bc
D = (2 * 3) - (-1 * -4)
D = 6 - 4
D = 2
x =
|1,-1|
|0,3|
------
2
x = (3 - 0)/2, = 3/2
y =
|2,1|
|-4,0|
-------
2
y = (0 + 4)/2 = 4/2 = 2
so
x = (3/2)
y = 2
The numerator of the y-variable looks like the Determinant of the problem.
Unless you mean that the numerator of the y-variable is the same as taking the coeffients of the y-variable and adding them together, -1 + 3 = 2
other than that, i think you can figure it out.
- Add to this Answer
- Ask a Question
Questioner's Rating
| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | Thank you so much for all of your help! You were so clear and I was able to understand each step as you took me through them. Thank you so much for replying so quickly. | ||
Related Articles
Advanced Math
Answers by Expert:
Sherman D.
Expertise
I can answer questions dealing in mathematics of all kinds except for Physics and Calculus, but i can answer questions in Pre-Calculus and Chemistry. I can also answer questions in Recipes of all kinds. I can find games cheats/walkthroughs, but i can`t find a specific game online or offline. I can also do history and recipes for alcoholic beverages.
Experience
Mathematics, Recipes, History, and Games.
Education/Credentials
High School graduated. I graduated with honors, and i was in Beta Club for a year and a half.
Awards and Honors
Principle's list and A and B honor roll in high school only.
©2012 About.com, a part of The New York Times Company. All rights reserved.