liliy
MATRIX: solve for x's:
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javawarrior
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wheres my matrix?
liliy
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im drawing it
liliy
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2a -6c=-8
b+2c=3
3a+6b-2c=-4
liliy
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i changed the x's to a,b,c so its easier:)PLZ HELP!!!
javawarrior
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are you familiar with row operations?
liliy
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ya
javawarrior
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this what your matrix should look like
liliy
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i did it but i wanna make sure i got the right answers
javawarrior
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| 1 0 0 | 19.6 |
| 0 1 0 | -7.4 |
| 0 0 1 | 5.2 __|
javawarrior
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what i got
liliy
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:(
liliy
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a=2 b=-1 c=2
javawarrior
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wait for some one else to solve it, i could be wrong :)
javawarrior
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if you substitute back my answers into the equations they work, so its right.
liliy
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aight. i give up:(
phi
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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
liliy
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woohooo @phi SO I GOT IT RIGHT???