help

[Guest]

Given the system below, solve for y:
2x + y - z = 7
3x - 2y + z = -4
x + 7y - 4z = 27

y = -2 is this right?

 

[pka]

You need to double check the sign.

 

[Guest]

opps it should be just 2

 

[Denis]

What's x and z, Adam?

 

[Guest]

what would y be then?

 

[Gene]

You can't tell if y is right till you know x & z so you can try all three in each of the original equations.

 

[Guest]

y = 2

and I dont know x and z

 

[stapel]

y = 2, and I dont know x and z

The exercise only asked for the value of y (perhaps you were supposed to use Cramer's Rule?), and I think the other poster missed that restriction.

Since you weren't asked for x or z, you don't need to find them.

Eliz.

 

[Guest]

But I am wanting to know what z is. How would I find if the same question only asked for z?

 

[stapel]

But I am wanting to know what z is. How would I find if the same question only asked for z?

Use the same method you used for finding only the value of y.

Eliz.

 

[Guest]

x = 1
y = 2
z = -3