Question

Find x,y,z
2x-y+2z=-9
-3x+y-z=6.5
x-y+3z=-8.5

Answer 1

First, solve for x in any equation.

Answer 2

You can use matrices for this if you know how

Answer 3

Can you please tell me how. It'll be helpful.

Answer 4

Yes matrices would be much easier. Nice thinking!

Answer 5

By matrices do you mean Cramer's Rule?

Answer 6

Well you can use reduce echelon form or cramer's rule, wouldn't both work. I know reduce echelon would work for sure especially since she got most of her leading 1in every row.

Answer 7

2 -1 2 -9
-3 1 1 6.5
1 -1 3 -8.5

I mean this is pretty butchered but if you know matrices you'll see what I mean right? You can use cramer's rule (If I remember it is Xi=Det Ai/Det A) However reduce echelon form might be faster, it all depends on what you like. What I'm saying is from Linear Algebra if you're taking it.

Answer 8

Oh, ok thanks!