Help me win cute girl @ work brownie points. (Math question)

[fitz19d]

Girl struggling with some algebra. Been too long for me. Trying to find x y and z from the following.

3x-y+2 = 11
2x-y-42 = 22
2x-4y+z = 13


I had through loose rough figuring that is probably wrong worked out to x = 55 and stuck on 97 + z = 4y or Alternatively 110-4y= 13-z. (EDIT) Alright now think I'm completely off myself. Per one of my college prof. "We're criminal justice, we don't do math."

She had some online thing that allegedly made it x = 4 y = -2 and z= -3. (Feel like that's wrong but again it's been 10 years and I hated math)

[Flatline]

x=-55
y=-174
z=-573

To solve subtract the second equation from the first and solve for x. They use x to solve for y in the first equation. Finally use x and y to solve for z in the third equation.

And be careful with those online things, they usually aren't based on algebraic solving but instead on approximations so they can be wrong in some cases.

[fitz19d]

Funny, after wasting a while, and getting about half of what you had, figured out handwriting struck.

Thought her Z were 2's.

So was actually
3x-y+z=11
2x-y-4z=22
2x-4y+z=13

Fun bringing back the old memories and frustrations. Sad part was generally people went to me for help at the time. I always used abstract math and ended up with the answer but couldn't show my work to save my life. Idiot savant?



Edit: And you gave me the right method to use so I find the right answers for the correct equations. Thanks very much.

x=-55
y=-174
z=-573

To solve subtract the second equation from the first and solve for x. They use x to solve for y in the first equation. Finally use x and y to solve for z in the third equation.

And be careful with those online things, they usually aren't based on algebraic solving but instead on approximations so they can be wrong in some cases.

[bryjcom]

This is a very long math problem. It involves back and forth and back and forth of the equations. This might help you
http://www.algebra.com/algebra/homew...on.148339.html

[bryjcom]

Started doing work on the equations. So far I got y= -2

I'll be back in a bit as soon as I solve for the others.

[bryjcom]

x=4

[fitz19d]

Save the effort if you see this, edited above to say I'd gotten it.

Kinda puts me in the mood for some more but she's off shift now and the math problems with her.

[bryjcom]

z=-3

[bryjcom]

Save the effort if you see this, edited above to say I'd gotten it.

Kinda puts me in the mood for some more but she's off shift now and the math problems with her.

Its all right, I had fun doing it. Seems like I got the same numbers she got.

Good luck with the girl.

[bigshane]

when I'm checking the kid's homework, and I find myself in the more and more familiar land of the brain-fart, www.wolframalpha.com/ saves me.