Posted by **brittany** on Tuesday, March 17, 2009 at 9:32pm.

i need help with my algebra 2 homework, the section is called using matrices to represent data. here is one of the problems:

-1/2A+(B-A) A=[7 3 -1 5]

[-2 8 0 -4] and

B= [6 0 11 -3]

[-5 2 -8 9]

i don't know how to do this problem and the book doesn't have a problem like this for me to look at i don't know which to solve first and does it matter which part you solve first

i would really appreciate it if you could help, thanks!

brittany

- algebra 2 -
**Reiny**, Tuesday, March 17, 2009 at 10:28pm
(-1/2)A is a scalar multiplication

simply multiply each member of the matrix by -1/2

to add or subtract matrices, they must first of all have the same dimension.

then simply add/subract the corresponding members.

here is a nice short webpage, look at the top examples.

http://www.purplemath.com/modules/mtrxmult.htm

- algebra 2 -
**brittany**, Wednesday, March 18, 2009 at 9:38pm
thanks soo much!!!that helps!

## Answer this Question

## Related Questions

- Linear algebra - find the inverse of the following matrices if they exist. [1 -2...
- linear algebra - if: A and B are matrices and A^2 is similar to B^2 Is A ...
- algebra - janice noticed that the number of problems she did for homework (x) ...
- Algebra (need help ASAP!!!!) - I didn't get how to do the problem. In my book it...
- Algebra II - Solve the given system by using a substitution method 9x-2y=3 3x-6=...
- Linear Algebra - Find the inverse of the matrices if they exist. Use the ...
- Algebra 2/Trig - We just started logarithms and exponential functions, and I'm ...
- algebra help - My class is doing a unit on the "completing the square method" ...
- Algebra - How do I work this problem, it is not a homework problem but a problem...
- Algebra... please - I am lost, and I bet it is simple, but I have been working ...