## Raja99 2 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. onedirection

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. Raja99

ya

4. NotTim

both?

5. Raja99

linear equations

6. Azteck

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

7. Azteck

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. Azteck

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

10. Raja99

i tried all equations are coming same

11. NotTim

well ,azteck's got this one covered.

12. Azteck

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

13. Raja99

ok

14. Azteck

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

15. Azteck

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

16. Raja99

thanks