Math Is Fun Forum

Mathaphobe

Member

Registered: 2006-05-20

Posts: 18

Help!

I am useing a saxon:
Algebra 1
an incremental development
second edition textbook and need a little help with
problem set 90 pg 323 problem 14:

solve by elimination:
14.)  7x+2y+3
        3x-3y=9

i keep getting 27x=12 that cant be right.....

thanks in advance

Last edited by Mathaphobe (2006-05-20 13:27:19)

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liuv

Member

Registered: 2006-05-14

Posts: 29

Re: Help!

21x+6y=9
6x-6y=18

27x=27

x=1

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Mathaphobe

Member

Registered: 2006-05-20

Posts: 18

Re: Help!

Thanks i think i see what i did wrong i forgot to multipliy the 9 and the 3 after the = sign

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Do you like my new avatar? (even if you don't i do )
(it's victor from oh my gods)
-An Incremental Development

liuv

Member

Registered: 2006-05-14

Posts: 29

Re: Help!

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I'm from Beijing China.

Mathaphobe

Member

Registered: 2006-05-20

Posts: 18

Re: Help!

Little help with this one....

(2x-5x+4)divide by(x+2)
-thanks

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Do you like my new avatar? (even if you don't i do )
(it's victor from oh my gods)
-An Incremental Development

liuv

Member

Registered: 2006-05-14

Posts: 29

Re: Help!

Last edited by liuv (2006-05-21 13:31:26)

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I'm from Beijing China.

krassi_holmz

Real Member

Registered: 2005-12-02

Posts: 1,905

Re: Help!

Ate answer depends on what do you want-do you need it factored or simplified (as liuv did) or what?

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