SOLUTION: Solve the system by elimination. x+5y-4z=-10 2x-y+5z=-9 2x-10y-5z=0 answers: A). (5,-1,0) B). (-5,1,0) C). (-5,-1,0) D). (-5,-1,-2)

Algebra ->  Linear-equations -> SOLUTION: Solve the system by elimination. x+5y-4z=-10 2x-y+5z=-9 2x-10y-5z=0 answers: A). (5,-1,0) B). (-5,1,0) C). (-5,-1,0) D). (-5,-1,-2)      Log On


   



Question 666632: Solve the system by elimination.
x+5y-4z=-10
2x-y+5z=-9
2x-10y-5z=0
answers:
A). (5,-1,0)
B). (-5,1,0)
C). (-5,-1,0)
D). (-5,-1,-2)

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 
Hi,
x+5y-4z=-10
2x-y+5z=-9 ||eliminating z
13x + 21 y = -86
2x-y+5z=-9
2x-10y-5z=0 ||eliminating z
4x - 11y = -9
13x + 21 y = -86
21x = -105, x = -5 and y = -1 and z = 0