document.write( "Question 631491: Use matrices to solve the system of equations (if possible). Use Gaussian elimination with back-substitution or Gauss-Jordan elimination. (If there is no solution, enter NO SOLUTION. If the system is dependent, set z = a and solve for x and y in terms of a.) \r \n" );
document.write( "\n" );
document.write( "3x − 2y + z = 7 \n" );
document.write( "−x + y + 2z = −12 \n" );
document.write( "x − y − 4z = 20\r \n" );
document.write( " \n" );
document.write( "\n" );
document.write( "(x,y,z)= \n" );
document.write( "
![\"\"](\"/images/stars/stars-13.gif\")
