Question

Is my answer correct? I have doubts on this one :/

Answer 1

check out the second equation with your choice of answer

Answer 2

Plug in the three values into each equation.
The solution is the set of three numbers that makes all three equations true.

Answer 3

I know that and I plugged in all, and B sounds like a better choice

Answer 4

your choice is incorrect

Answer 5

So both C and B are incorrect?

Answer 6

@cwrw238

Answer 7

...anyone there?

Answer 8

if my choice is incorrect, then what is the correct choice?

Answer 9

C is incorrect. No one said anything about the other choices being incorrect.

Answer 10

The correct choice is the one that works in all equations.

Answer 11

So, b is the answer

Answer 12

Let's try A.

Answer 13

Okay, once second, I'll redo the equation.

Answer 14

=-16 is what I got for the first one. :/

Answer 15

A: (-4, 0, 12)
First eq.: x + 3y - z = 6
Let's see if choice A works on the first equation.
-4 + 3(0) - 12 = 6
-16 = 6
Choice A does not work on the first equation. There is no need to test out choice A any further.
Choice A is not the answer.

Answer 16

Good work.
Since Choice A does not work in the first equation, Choice A cannot be the answer. Now move on to choice B.

Answer 17

Remember, for a choice to be the answer, it has to work on ALL three equations.

Answer 18

6=6

Answer 19

for the second one

Answer 20

Choice B: (-3, 5, 6)
Eq 1: x + 3y - z = 6
-3 + 3(5) - 6 = 6
-3 + 15 - 6 = 6
6 = 6
Choice B works on the first eq.
Let's move on to the second eq.

Answer 21

Wow. You're faster than I am.

Answer 22

Good.
Now we try choice B with the second eq.

Answer 23

15=-10 is what I got

Answer 24

4x - 2y + 2z = -10
4(-3) - 2(5) + 2(6) = -10
-12 -10 + 12 = -10
-10 = -10
I get -1 on the left side.
Can you try it again?

Answer 25

I meant -10 above. I get -10 on the left side.

Answer 26

WAIT IT'S -10=-10 I GOT IT

Answer 27

That means according to my calculations, choice B works on the second eq. too. There seems to be hope for choice B. Now we move on to eq. 3 and choice B.

Answer 28

B is the answer!

Answer 29

-12=-12

Answer 30

Can You be my tutor???

Answer 31

6x + z = -12
6(-3) + 6 = -12
-18 + 6 = -12
-12 = -12
Also true.
Choice B is the answer since it works in all three equations.

Answer 32

LOL

Answer 33

This was a way of checking if a solution is correct.
It may also be important to learn how to solve the system if you were not given choices.

Answer 34

I have one that I'm not sure about.

Answer 35

start a new post & i'll look for it

Answer 36

Okay c: