# Math Help - matrics algebra

1. ## matrics algebra

Can someone help me with these math problems?

1. use the following matrix
x= [1 2 3 4]
[4 -1 -2 0]
[6 1 5 -3]
what is a 2,3 equal?
a. -2
b. 1
c. -1
d. 5

2. use the following matrix
x= [1 2 3 4]
[4 -1 -2 0]
[6 1 5 -3]
what is a 3,1 equal?
a. 3
b. 1
c. 6
d. -2

any help that you can give me would be very much appreciated.

2. $a_{j,k}$ is the entry in the in the jth row and the kth column of the rectangular display.

3. Notation for matrices goes in this order:

1) Rows
2) Columns

Hence:

$a_{i,j} \Rightarrow a_{r=i,c=j}$