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[4 -7 | -2]
[1 2 | 7]

matrix is just the elimination process without the variables getting in the way

with any luck; x=3 and y = 2

4(3)-7(2)=-2
12 - 14 = -2 checks
(3)+2(2)=7
3 + 4 = 7 checks

dear god thank you tho i still dnt quite understand how to do the other 4 :(

post them lol

k thank you

instead of trying to hunt down the [,|, and ] buttons im gonna leave them out ot it ;)

alrighty thanks want me to post here or under ask a question?

youre call ;)

ill post here

:)

11. 5x=3y-50
2y=1-3x
13. x+y+z=-2
2x-3y+z=-11
-x+2y-z=8

do you know how to solve a system of equations by elimination?

if i saw the problem i could tell you but i dnt remember alot of precal vocab

the ansers shld come out to be x= -97/19 and y= 155/19 in the back of the book

let me recheck without the explanations ok....

5x -3y=-50
3x+2y = 1 <- had a -3 there...bad me lol

its fine man

31
5
---
155 lol 155/19

its easier on the paper lol

does it look any easier yet :)

starting to but i look at these problems and i just feel myself getting lost :(

1 1 1 = - 2
2 -3 1 = -11
-1 2 -1 = 8

when we look at this the 1st and 3rd are ready to be added togeter and eliminate that -1 right

oh
the first and third 1 tho

dnt we need the bottom right to be 1?

i guess we do that later?

1 1 1 = - 2
-1 2 -1 = 8
------------
0 3 0 = 6 (/3)
0 1 0 = 2 ..... y = 2

we use R1 to calibrate R2 and R3

but hte third row is z?

so dnst it also need it to be 0 0 1?

1 1 1 = - 2 (*-2)
2 -3 1 = -11
-2 -2 -2= 4
2 -3 1 = -11
--------------
0 -5 -1 = -7 <- new R3

0 1 0 = 2 (*5)
0 -5 -1 = -7
0 5 0 = 10
0 -5 -1 = -7
-------------
0 0 -1 = 3 (*-1)
0 0 1= -3 z=-3

1 1 1 = - 2
0 1 0 = 2
0 0 1 = -3
1 2 -3 = -2
1 0 0 = -2 -2 3
1 0 0 = -1 x = -1 right?

wait when did R1 become 1 2 -3 ?

1 0 0 = -1
0 1 0 = 2
0 0 1 = -3
1 1 1 = -2 : mean x+y+z = -2
x +2 - 3 = -2
x = -2-2+3
x = -1

oh ok

whenever we know what a '1' in a column equals; we can substitute it to find aonther :)

x y z = #
---------
1 0 0 = -1
0 1 0 = 2
0 0 1 = -3

i dont even get the option of failing this cause my navy nuke recruiter wld kill me :(

lol.... i dont know much about matrixes, but i do know this :)

give me another

linear algebra has lots of matrix stuff in it :)

and maybe discrete mathematics

post a new question box so we dont bog this post down ...long posts tend to slow my system ;)

k ill throw up the last two of these and grab a snack and brb here they are

ok then ill do that