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#1
08-01-2007, 07:42 PM
 lancer Guest Posts: n/a

i dont get it i listened to teacher but i can't get how to do elimination properly can some1 give me an example of how to do i would really appreciate it.

heres one:

for y

-x+5y=7
+
3x-2y=-6
----------
times 3

-3x+15y=21
+
3x-2y=-6
-----------
0x+13y=15

13y/13=15/13

y= 15/13

For X

-x+5(15/13)=7
-x+75/13=7
-x = 7-75/13
-x = 91-75/13
-x = 16/13
x = -16/13

Is that right...im not to sure
#2
08-01-2007, 09:29 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,340 Rep Power: 12
Re: help please exam tommarrow =(

You've lost me a bit, adding formulas together doesn't sound right, solve for each one.

-x + 5y = 7
5y = 7 + x
(subtract 7 from each side)
x = 5y - 7

Next one
3x-2y=-6
3x = 2y - 6
(divide each side by 3)
x = 2/3y - 2

and so on.... Or did I completely misunderstand your problem?
#3
08-02-2007, 10:10 PM
 Professor Robie Guest Posts: n/a
Re: help please exam tommarrow =(

You did it right.

Professor Robie.

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