Question

Solve the following system of equations.

2x – 3y + z = –1
2x – 2y – 2z = –8
x + 5y – 3z = 2

Answer 1

can you use matrix (linear algebra)?
if not:
1) subtract second from first
2) multiply third eq by (-2) and add to first
you'll get 2 equation with 2 variables - solve it

need help with it?

Answer 2

i thought u were supose to add the first and the second equations

Answer 3

you can add, but in order to cancel out x you need to multiply one of the equations by (-1)

Answer 4

you can re-write it as:
2x-3y+z=-1
-2x+2y+2z=8
-2x-10y+6z=-4

now add second to first - one equation
add third to first - second.
solve it for y & z

Answer 5

I got: z=3, y=2, x=1

Answer 6

i got that too. thanks tho

Answer 7

it's nice the answer matching :)
welcome!