Question

Medal and fan


Which expression gives the x-coordinate of the solution of the system?
3x-y+z=9
x+2y+z=3
5x+6y+2x=2

Answer 1

the best answer would be number B

Answer 2

medal

Answer 3

why?

Answer 4

how did you fin the answer?

Answer 5

@mathmate help please?

Answer 6

Are you familiar with Cramer's rule?

Answer 7

not really, I barely understood it :(

Answer 8

This link contains an example that is almost the same as yours.
Try to follow it and post if you have questions.
http://www.purplemath.com/modules/cramers.htm
Because of formatting limitations, the link will explain clearer than what we can do here.
If you have a problem with a particular step, please post.

Answer 9

You also need to know how to expand a determinant, 2x2 or 3x3.
Try the following link:
http://mathworld.wolfram.com/DeterminantExpansionbyMinors.html

Answer 10

ok thank you!!

Answer 11

is it C?

Answer 12

Sorry, I am not sure if the answers match the problem. The denominator should be -13.
If you confirm that there are no typos in your question, you may want to post a new problem or check with your teacher.