## anonymous 3 years ago Solve: x+y+z=561.5; 3.35y+5.6z=373; 5.6x+2.25y=2769.9; 3.35x+2.25z=1505.66 Pl find x,y and z.

1. anonymous

what grade u in? ahhh this is hard...sorry this isnt much help.

2. NotTim

are these al lthe same values for x,y, and z? IS this vectors (i don't remember vectors well)?

3. anonymous

ya

4. NotTim

both?

5. anonymous

linear equations

6. anonymous

Make x the subjext for the last equation and y the subject for the second equation. Then sub those into the first equation.

7. anonymous

YOu will get everything in z for the first equation once you do what I told you.

8. NotTim

why not rearrange 1 of the equations that has 3 variables, and then substitute in another equation with 2 variables?

9. anonymous

Then you can solve for z and finally you can find y. and then x at the end.

10. anonymous

i tried all equations are coming same

11. NotTim

well ,azteck's got this one covered.

12. anonymous

$3.35x+2.25z=1505.66$ $3.35x=1505.66-2.25z$ $x=449.45 -\frac{45}{67}z$

13. anonymous

ok

14. anonymous

Do the same thing for the second equaiton but in the second equation, make y the subject.

15. anonymous

I got to go somewhere. Toodles. Good luck with that.

16. anonymous

thanks