# How do I use Cramer's rule to solve the system of equations #3x+4y=19# and #2x-y=9#?

##### 1 Answer

Mar 1, 2015

The answer is:

Remembering that the derminant of a matrix

is:

First of all let's write the matrix of the coefficients:

and let's find the determinant:

Now let's find

so:

And now the same thing with the second column:

so:

And now the solution is: