Question 394042: solve using matrices
x-2y+4z=-8
2x+2y-z=11
x+y-2z=10
Answer by pie90010(44)   (Show Source):
You can put this solution on YOUR website! ahhh I LOVE MATRICES :D
so just make your equation into a matrix first
[ 1 -2 4] [x] [-8]
| 2 2 -1| |y| = |11|
[ 1 1 -2] [z] [10]
Let ^ = A Let ^ = B
you CANT divide matrices, so multiply by the inverse, same thing right? :D
find the inverse of matrix A first, you can simply do this with a calculator
A^-1 * B
And you'll find your answers will be
x = 4
y = 0
z = -3
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