Question

What is the solution to the following system?

3x+2y+z=20
x-4y-z=-10
2x+y+2z=15

A. (2, 3, 4)
B. (4, 3, –2)
C. (4, 3, 2)
D. (6, 7, –2)

Answer 1

I think it's A, (2, 3, 4)

If not A, it might be C.

Answer 2

hello :
3x+2y+z=20...(1)
x-4y-z=-10...(2)
2x+y+2z=15...(3)
answer : C
you can subsct x= 4 y =3 z=2 in (1) , (2) , (3) equations