Question

Which expression gives the x-coordinate of the solution of the system?

Answer 1

http://www.purplemath.com/modules/cramers.htm

Answer 2

start by finding the determinant of coefficient matrix

Answer 3

how do I do that?

Answer 4

you knw how to calculate determinant ?

Answer 5

Yeah I can do that

Answer 6

good, and knw what a coefficient matrix is ?

Answer 7

may be that was a different system of equations^

Answer 8

here is the coefficient matrix for given set of equations, and its determinant :
http://www.wolframalpha.com/input/?i=determinant+%7B%7B3%2C-1%2C1%7D%2C%7B1%2C2%2C1%7D%2C%7B5%2C6%2C2%7D%7D

Answer 9

So how do I do this one?