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!

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