## liliy 3 years ago MATRIX: solve for x's:

1. javawarrior

wheres my matrix?

2. liliy

im drawing it

3. liliy

2a -6c=-8 b+2c=3 3a+6b-2c=-4

4. liliy

i changed the x's to a,b,c so its easier:)PLZ HELP!!!

5. javawarrior

are you familiar with row operations?

6. liliy

ya

7. javawarrior

this what your matrix should look like

8. liliy

i did it but i wanna make sure i got the right answers

9. javawarrior

| 1 0 0 | 19.6 | | 0 1 0 | -7.4 | | 0 0 1 | 5.2 __|

10. javawarrior

what i got

11. liliy

:(

12. liliy

a=2 b=-1 c=2

13. javawarrior

wait for some one else to solve it, i could be wrong :)

14. javawarrior

if you substitute back my answers into the equations they work, so its right.

15. liliy

aight. i give up:(

16. phi

If we start with this matrix 2 0 -6 -8 <--- divide this row by 2 to simplify it 0 1 2 3 3 6 -2 -4 1 0 -3 -4 <--- multiply this row by -3 and add to the 3rd row 0 1 2 3 3 6 -2 -4 1 0 -3 -4 0 1 2 3 0 6 7 8 <--- we added -3 0 9 12 to the 3rd row 1 0 -3 -4 0 1 2 3<---multiply by -6 and add to the 3rd row 0 0 -5 -10 1 0 -3 -4 0 1 2 3 0 0 1 2 <---divided by -5 now back solve

17. liliy

woohooo @phi SO I GOT IT RIGHT???