Question

PLEASE HELP
1.) x+y+z=-1
2x-y+2z=-5
-x+2y-z=4

Answer 1

I have -x-y-z=-1
2x+3y=3 those are my two separate answers now what?

Answer 2

Just hang on a minute. I will solve this first, then explain.

Answer 3

thank you!

Answer 4

Okay, so here's what we can do here:

Answer 5

1) Combine the 1st and 3rd equations together

Answer 6

When you do that you will end up with

3y = 3

then
y = 1

Answer 7

Next, go ahead and replace y with 1 in each equation:
x+1+z=-1
2x-1+2z=-5
-x+2(1)-z=4

Answer 8

Notice that when you do that you'll end up with
x + z = -2
x + z = -2
x + z = -2

Answer 9

no u don't, I combined the 1st and 3rd equation and I got 2x+3y=3 ????

Answer 10

Try to figure out how I got that.

Answer 11

Each equation is the same

Answer 12

I'll show you how to combine the 1st and 3rd equations

Answer 13

x+y+z=-1
2x-y+2z=-5
-x+2y-z=4