Question

Solve the system by elimination.
x+5y-4z=-10
2x-y+5z=-9
2x-10y-5z=0

Answer 1

from first equation u can get X=10-5y+4z
put this in eqns 2nd and 3rd.
now u get 2 eqns with 2 unknowns.
eliminate y from this eqns by finding a y= expression from one eqn and put it in the other eqn.
now u cn solve