Top Posters
Since Sunday
5
a
5
k
5
c
5
B
5
l
5
C
4
s
4
a
4
t
4
i
4
r
4
Home Q & A Board Science-Related Homework Help Mathematics
New Topic  
_biology _biology
wrote...
Go to Answer
11 years ago
i need help with my homework since i missed this class!! HELP!!
please tell me everything don't skip anything. it will all help.
Read 516 times
2 Replies
Replies
Answer accepted by topic starter
ikamu19ikamu19
wrote...
#1
Posts: 36
Rep: 0 0
11 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

Tonbon1221 Author
wrote...
#2
11 years ago
When you have a system of equations and you are trying to solve for x and y, multiply one equation by a certain number to eliminate x or y in the other equation by adding the transformed equation and the second equation.

Example:

2x+y=8 and 4x+3y=12

Multiply the first equation by -2. This will make your equation -4x-2y=-16.

Add this new equation to the second equation. This will result in one equation with one variable. 0x+y=-4

Now you have your y value. Substitute -4 into either of the original equations for y. I have chosen the first one because it is simpler. 2x+(-4)=8

2x=12   x=6

Now you have found x and y. (x,y)=(6,-4)

Hope this helps
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1389 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 252
  
 240
  
 303
Your Opinion
Previous poll results: Who's your favorite biologist?