Algebra help!
posted by Becca .
1.) Solve the system by triangularizing the augmented matrix and using back substitution.
xy+z=1
xy4z=7
4x+y+z=6
2.) Perform the indicated row operation, then write the new matrix.
4 4  4
9 6  5 2R1+ R2 > R2
3.) Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give the solution in terms of a parameter.
x+y+z=0
3x+2y+5z=18
15x+10y+25z=89
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