# [SOLVED] matrix help

• Nov 4th 2008, 01:32 AM
jvignacio
[SOLVED] matrix help
just wondering how they got

using matrix, solve these linear equations:

$-x+y=4$
$2x+5y=-2$

$
X = A^{-1}C
$

$X = (a, b, c, d) (x, y)$

$
X = (\frac{-1}{3}, \frac{1}{3}, \frac{2}{15}, \frac{1}{15})(4,-2)
$

$
X = (-2, \frac {2}{5})
$
<--- how did they get this answer. Multiplying what exactly from above.

EDIT: its okay i figured it out :)