Help with few math problems please?

[andylui8]

[h=1]Help with -14(x-2)+28x=14(x+4)-28?[/h]Extra question help please
1. I=(nE/(nr+R) for n
2. x+y=5, x+y= 7 1,no,infinite solutions?
3.numerical value (-5x)^2/(2x+6) x= 4, x= -3

 

[micuzzo007]

solve -14(x-2)+28x=14(x+4)-28

simplifying results in 0x=0................ this implies infinite # of solutions for x

 

[micuzzo007]

solve for n if I=nE/(nr+R)

then..
(nr+R) I= nE

nrI-nE= -RI

n(rI-E) =-RI

n= -RI/(rI-E) or n = RI/(E-rI)

 

[micuzzo007]

Solve for x+y=5 & x+y=7

Help with -14(x-2)+28x=14(x+4)-28?

Extra question help please
1. I=(nE/(nr+R) for n
2. x+y=5, x+y= 7 1,no,infinite solutions?
3.numerical value (-5x)^2/(2x+6) x= 4, x= -3

For 2. Since the two lines are parallel, this implies intersection at infinity..& thus there is no solution for this system of equations

For3. If x=4..then answer is 200/7
If x=-3.. then answer is undefined since the denominator=0

 

[lookagain]

Homework not done here.
Read "read before posting".

micuzzo007, please do type out solutions to problems without the original poster contributing at least some work and/or pertinent comments or questions about the exercise(s). \(\displaystyle \ \ \ andylui8, \ \ \) please post one problem per thread. \(\displaystyle \ \ \ micuzzo007, \ \ andylui8, \ \ and \ \ others, \ \ \) please read the posting rules at this link: http://www.freemathhelp.com/forum/threads/41536-Read-Before-Posting!!