Question

MATRIX: solve for x's:

Answer 1

wheres my matrix?

Answer 2

im drawing it

Answer 3

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

Answer 4

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

Answer 5

are you familiar with row operations?

Answer 6

ya

Answer 7

this what your matrix should look like

Answer 8

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

Answer 9

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

Answer 10

what i got

Answer 11

:(

Answer 12

a=2 b=-1 c=2

Answer 13

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

Answer 14

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

Answer 15

aight. i give up:(

Answer 16

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

Answer 17

woohooo @phi SO I GOT IT RIGHT???