Question

Im new to this site.
x-y+z=-1
x+y+z= 5
x+y-z= 11
A) Nothing
B) (5, -3, 3)
C) (5, 3, -3)
D) (-3, 5, 3)

Answer 1

1. Create two sets of equations such that you are able to eliminate the same variable in both. In this case, we can create two sets of equations to eliminate the z variable by pairing equation one with equation three, then pairing equation 2 with equation three:

x - y + z = -1
x + y - z = 11

x + y + z = 5
x + y - z = 11

Now adding both sets of equations together and this is what you get:

2x = 10
2x + 2y = 16

From there, you should be able to finish solving.

Answer 2

You should easily be able to substitute 2x = 10 into the second equation. We already know what x equals.

So solve this to get y:
10 + 2y = 16

Answer 3

If you figure out x and figure out y, then figuring out z will be a no-brainer.

Answer 4

ok ty, can u help me with another 1?

Answer 5

Not so fast...you didn't confirm your answer to this one.

Answer 6

You should let me know which answer choice you picked that way I know you understand it.

Answer 7

oh i picked 5/3/-3

Answer 8

Very good.

Answer 9

u can u help with the next 1

Answer 10

Is the next one similar to this question? If it is, then you should be able to figure it out on your own.

Answer 11

its not.

Answer 12

Okay, close this question, then post your next question as a new one.