Question

x + 3y + 2z = –16
2x – y + 2z = –15
2x – 2y – z = 1
Answer

(4, 4, –1)

(2, –4, –3)

(–3, –1, –5)

(–3, 5, –2)

Answer 1

Are you using Algebra or Linear Algebra?

Answer 2

algebra

Answer 3

x=-16-3y-2z
2x=-15+y-2z so x= (-15+y-2z)/2
-16-3y-2z=(-15+y-2z)/2
-32-6y-4z=-15+y-2z

-7y-2z=17

2x-2y-z=1
2x=1+2y+z
x=(1+2y+z)/2
(-15+y-2z)/2=(1+2y+z)/2
-15+y-2z=1+2y+z

-y-3z=16

Answer 4

-7y-2z=17
-y-3z=16 so y= -3z-16 than -7(-3z-16)-2z=17
21z+112-2z=17
19z=-95

z= -95/19 so than y= -3(-95/19)-16=285/19 -16 =(285-304)/19 = -19/19 =
= -1

y= -1
z= -95/19

- so than x= -3y-2z-16 = -3(-1)-2(-95/19)-16 = 3+190/19-16=3+10-16=
= -3

x= -3
y= -1
z= -95/19