Question

Matrix Operations help!

Answer 1

Which one first?

Answer 2

Probably the first one.
I just really need help because I have no idea what's going on.

Answer 3

1st three are very easy.
1) multiply every matrix element (every number in the matrix) by 5
2) add each respective matrix element:
\[\left[\begin{matrix}2-11 & -8+5 & 3-9 \\ 0-2 & 1+6 & 4-1\end{matrix}\right]\]
3) same thing as 2) but with subtraction.

do those and we will discuss the last two.

Answer 4

I'm honestly lost. I have no idea what matrixes even are, this is the first time I've heard of them.
So I'm still not sure what to do

Answer 5

I think you're talking about 4) 5) and 6)

Answer 6

not 1) 2) and 3)

Answer 7

sorry my server is slow...
yes now that you mention it you are right.
so for the first ones all we need to do is write out the numbers in a matrix format\[(x.y)\to \left(\begin{matrix}x \\ y\end{matrix}\right)\]so we just turn the thing on its side, think you got that bit?

Answer 8

is that all we do for those? that seems very simple.

Answer 9

Yes, they are all quite simple except for the last two.
As far as you're concerned matrices (plural of matrix) are a bunch of numbers arranged into a rectangle.
For the 4th one all you do is multiply every number in the matrix (they are called elements, btw) by 5.
what is
6*5 5*5 -1*5
-4*5 0*5 7*5
So now we will have a new matrix, the same size as the first (2x3) by each number has been multiplied by 5. Think you can write the numbers out?
Just type it the way I did above, no equation feature necessary.

Answer 10

Thank yoU!

Answer 11

you're welcome, let me know if you get stuck
or if you want me to explain the last 2...

Answer 12

ok i will

Answer 13

I'm on the last two, and i'm a little stuck

Answer 14

are the last two like 5 and 6, but multiplication?

Answer 15

like do you turn the ones on the left side and then multiply with the ones on the right?

Answer 16

yes, sorry I was afk there.

Answer 17

well, here's a tutorial page in the meantime...
http://www.purplemath.com/modules/mtrxmult.htm
look at the part with the hand, that is how you will multiply these matrices.