Question

Use the substitution method to solve the following system of equations.
x + 2y - z = 2
3x + y - 2z = -15
3x + 4y - 3z = -2

Answer 1

a) (7, -4, -1)
b) (-7, -4, 1)
c) (7, -4, 1)
d) (-7, 4, -1)

Answer 2

The trick to this questions, is to eliminate a variable one at a time until you have one variable that you can find.

Answer 3

to these*

Answer 4

When you use the substitution method, you make any one of the three variables [x, y, z] the SUBJECT.

Answer 5

i got answer a (7,-4,-1)

Answer 6

The first equation should be a sinch to make x the subject.

Answer 7

Okay. Let me check if you're right.

Answer 8

Nope it's incorrect.

Answer 9

okay i tried again c was m next answer

Answer 10

Please don't guess the answer. Please show what you've done to me first and I will see what you've done wrong. ;)

Answer 11

So next time, you won't make the same mistake again if it ever happens.

Answer 12

i actually worked it out i think i just missed something.. was the correct answer c

Answer 13

Could you be willing to show your working out for this question please? So we can look at it and tell you instantly where you went wrong.

Answer 14

to much to type out i gotta get thi sassignment done

Answer 15

on the next one forsure tho!

Answer 16

so? can you help me with the answer bro?

Answer 17

Sorry, no can do, there's a strict policy on this website not to give answers away. Even if I did give you the answer, what good does it do to you and me? I get no benefit from giving you the answer, and you wouldn't be able to do a question like this next time and you would come back and ask a similar question to this one which is not what we want to do.

Answer 18

I'm here to guide you and fix up any mistakes you've done. SO next time, you wouldn't need to come and ask the same question over and over again because you would of known how to do it!

Answer 19

alright well i need the answer so lets work it out i guess.

Answer 20

I've got to go somewhere in 10 minutes, so I will only be helpful for around 5 or so minutes.

Answer 21

Could you show me what you've done so I can quickly correct it?