SOLUTION: i need help with matrices and systems of equations. [1 -7 -1] [2 -3 2] [1 3 -2] ___________ [1 2 -1] [2 3 2] [1 -2 -2] represents the values of which vari

Algebra ->  Matrices-and-determiminant -> SOLUTION: i need help with matrices and systems of equations. [1 -7 -1] [2 -3 2] [1 3 -2] ___________ [1 2 -1] [2 3 2] [1 -2 -2] represents the values of which vari      Log On


   



Question 33914: i need help with matrices and systems of equations.
[1 -7 -1]
[2 -3 2]
[1 3 -2]
____________
[1 2 -1]
[2 3 2]
[1 -2 -2]
represents the values of which variable in the solution of the equations below?
x+ 2y - z = -7
2x +3y + 2z = -3
x-2y-2z=3
a) x
b) y
c) z
d) none of the variables

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
solving for "y".
Notice that the constant numbers from the equation are
placed in the "y" column.
The denominator is called the "coefficient degerminant".
Cheers,
Stan H.