Question

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

Answer 1

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