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| | The New Kid Join Date: Aug 2007
Posts: 3
|  I have problems with more than 1 variable. :
11-06-2007
The problem is and 3y-20+4y+4=180. In my textbook the answer is 28=y, but i keep getting 22.5...It is a parallelogram with two diagonals that bisect into 2 pairs of congruent segments.
Last edited by MuRdaMaYNe; 11-06-2007 at 01:24 PM.
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 | | | Freshman Bully Join Date: Jun 2007 Location: ha.
Posts: 1,076
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11-06-2007
I'm going to assume you mean 3y-20+4y+4=180 and that those are consecutive interior angles.
I'll walk through this...
Since you want to combine like terms, you will have 7y-16=180
You will add 16 to both sides to get the variable by itself, ending up with 7y=196
Divide both sides by 7, and you get y=28.
Hope I helped.
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| | | The New Kid Join Date: Aug 2007
Posts: 3
|
11-06-2007
Quote:
Originally Posted by Qu4dra  I'm going to assume you mean 3y-20+4y+4=180 and that those are consecutive interior angles.
I'll walk through this...
Since you want to combine like terms, you will have 7y-16=180
You will add 16 to both sides to get the variable by itself, ending up with 7y=196
Divide both sides by 7, and you get y=28.
Hope I helped. | Thanks. I guess I was supposed to add the variables first right?
I have another problem which i don't understand. 4x-2+3y-1=180. I don't know what to do with the variables.
Last edited by MuRdaMaYNe; 11-06-2007 at 01:40 PM.
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| | | Freshman Bully Join Date: Jun 2007 Location: ha.
Posts: 1,076
|
11-06-2007
Quote:
Originally Posted by MuRdaMaYNe Thanks. I guess I was supposed to add the variables first right?
I have another problem which i don't understand. 4x-2+3y-1=180. I don't know what to do with the variables. | Yep.
Well, what you need to do for that is set up two equations and get either the x's or the y's to cancel out. I can't do it now, but I might later. Sorry. You might be better off asking your teacher tomorrow; I'm kind of busy today.
__________________
My head is made up of memories,
Most of them useless delusions.
This room is bored of rehearsals,
I'm sick of the boundaries,
I miss you so much.
|
| | | The New Kid Join Date: Nov 2007
Posts: 3
|
11-06-2007
Quote:
Originally Posted by MuRdaMaYNe Thanks. I guess I was supposed to add the variables first right?
I have another problem which i don't understand. 4x-2+3y-1=180. I don't know what to do with the variables. | ok i think i can help with this, its been a while though. ima do work. edit in a min.
STILL WORKING...edit again still working...dammit. its been too long. i think i solved it but its such a messed up way im not gonna try to explain, ok im tryin again not finishing this will bug me.
4x-2+3y-1=180
combine like terms
4x+3y=183
divide each side by 4
x+3y=45.75
divide each side by 3
x+y=15.25
move x to one side
y=15.25-x
input this where ever y is in the original problem
4x-2+3(15.25-x)-1=180
solve
4x+47.75-3x=183
combine like terms
x+47.75=183
add -47.75 to both sides
x=135.25
ok there is x ill make new post for y 
Last edited by PAINFULDEATH666; 11-06-2007 at 08:42 PM.
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| | | Beats up Foreign Ex Students Join Date: Aug 2007 Location: Three Oh Three
Posts: 2,007
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11-06-2007
By the way, the first problem only has one variable. |
| | | The New Kid Join Date: Nov 2007
Posts: 3
|
11-06-2007
Quote:
Originally Posted by YZFRydn By the way, the first problem only has one variable. | i know, he posted another
back to problem
starting at x+y=15.25
do the opposite of last time and move y to one side
x=15.25-y
use that in place of x in original problem
4(15.25-y)-2+3y-1=180
solve
61-4y+3y=183
61-y=183
add-61 to both sides
-y=122
multiply each side by -1
y=-122
check work
plug in values for each variable to original problem
4(135.25)-2+3(-122)-1=180
solve
541-2-366-1=180
i did something wrong fixing. will edit posts
im sorry i have chores to do i will finish this later. i can't find where i messed up, this is the proper mehtod. if u check to work ull find where i went wrong,
Last edited by PAINFULDEATH666; 11-06-2007 at 08:58 PM.
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| | | The New Kid Join Date: Aug 2007
Posts: 3
|
11-07-2007
Thanks...I finally got it. |
| | | The New Kid Join Date: Nov 2007
Posts: 3
|
11-07-2007
glad i could help. i remember this gave me the most trouble out of the whole year in my geometry class |
| | | Beats up Foreign Ex Students Join Date: Aug 2007 Location: Three Oh Three
Posts: 2,007
|
11-07-2007
Quote:
Originally Posted by PAINFULDEATH666 i know, he posted another
back to problem
starting at x+y=15.25
do the opposite of last time and move y to one side
x=15.25-y
use that in place of x in original problem
4(15.25-y)-2+3y-1=180
solve
61-4y+3y=183
61-y=183
add-61 to both sides
-y=122
multiply each side by -1
y=-122
check work
plug in values for each variable to original problem
4(135.25)-2+3(-122)-1=180
solve
541-2-366-1=180
i did something wrong fixing. will edit posts
im sorry i have chores to do i will finish this later. i can't find where i messed up, this is the proper mehtod. if u check to work ull find where i went wrong, | Thank you for pointing out something obvious. I was referring to his first post and thread title. |
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