Algebra Multiple Choice help!!
posted by Kris .
I need help with these! I got B for 1. C for 2. and D for 3. Thanks for the help!
1.) Find the values of a, b, and c that will make the statement true.
[5 a 2] [5 102]
[3 4 –b] = [3 4 3]
[2c 5 9] [2 5 9]
a.) 8R1R2> =R2
b.) 8R1R2 > =R2
c.) –8R1 +R2 > =R2
d.) 8R1R2 > =R2
2.) 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
A.) (3,2,1)
B.) (3,2,0)
C.) Coincident dependence; {(x,y,z) x+yz=0
D.) No solution, inconsistent
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+yz=3
xy2z=6
2xy+z=3
A.) (0,0,4)
B.) (0,0,3)
C.) Coincident dependence; {(x,y,z)  x+yz=3
D.) No solution, inconsistent

I think they r all right. some might come by and check them later but i think they r.