Question

I've been going at this for hours now and simply can't grasp the concept. If you need a question answered, feel free to send them my way. Thanks!


Use the substitution method to solve the following system of equations.

x + 2y - z = 7
4x - y + 3z = -2
2x + 2y - z = 9


ANSWER CHOICES:

(2, 1, 3)

(2, 1, -3)

(-2, 1, -3)

(-2, -1, 3)

Answer 1

subtract 3rd and 1st eqn,, get value of x directly

then its easier..

Answer 2

I still do not understand

Answer 3

what do you get when you subtract 3rd and 1 st eqn ?

Answer 4

OH, -2

Answer 5

thats on RHS,, what will be your LHS ?

Answer 6

So it's either C or D, but what else do I have to figure out?

Answer 7

nops..you did mistake..check again..

Answer 8

Come again? Not familiar

Answer 9

7 - 9 = -2

Answer 10

(2x + 2y - z)-(x + 2y - z) = 9 - 7
x = ?

Answer 11

Not sure what x equals, that's what I need to find

Answer 12

What do I substitute in place of x?

Answer 13

you dont have a good conceptual base / understanding do you ?

Answer 14

I obviously don't which is why I'm seeking for assistance

Answer 15

You don't have to be an a**hole though

Answer 16

InsanelyChaotic, that was uncalled for. He is only trying to figure out how to best help you

Answer 17

I viewed it as an insult

Answer 18

My apologies if otherwise