Posted by **cecelia** on Wednesday, January 2, 2008 at 3:03am.

solve the following simultaneous equations using matrices 3x-6y=24 and -4x+5y=-23

- maths -
**drwls**, Wednesday, January 2, 2008 at 3:44am
Assuming you know how to calculate a determinant, the answer is

x = |24 -6| / |3 -6| = -18/-9 = 2

....|-23 5|/ |-4 5|

You can get y by substitution of x=2 in either equation, or from a separate ratio of determinants.

If you are not familiar with the notation, nor why I chose those numbers, nor how to calculate the determinants, then you need to review the subject. Your textbook should contain that information.

- maths -
**drwls**, Wednesday, January 2, 2008 at 3:48am
Those are supposed to be square 2 x 2 matrices in numerator and denominator of my previous answer. It is hard to get the type spacing right to align the top and bottom halves. The | | symbols denote the determinant of the matrix.

## Answer This Question

## Related Questions

- maths pls help - 1. Solve the following simultaneous equations: log2 xy = 7 log2...
- Mathematics - write the following simultaneous equations in the form of AX= B ...
- Mathematics - write the following simultaneous equations in the form of AX= B ...
- Mathematics - write the following simultaneous equations in the form of AX= B ...
- Mathematics - write the following simultaneous equations in the form of AX= B ...
- Mathematics - write the following simultaneous equations in the form of AX= B ...
- Pre Calculas - 7. For the function defined by: f(x)= {x^2, x<=1} {2x+1, x>...
- maths - solve the following pair of simultaneous equations. 2x-3y=13 3x+y=3
- Maths - Solve Graphically the following simultaneous linear equations 5x+7y=13 ...
- Maths - Solve Graphically the following simultaneous linear equations 2y-3x=12 x...

More Related Questions