## Differential Equations and Linear Algebra (4th Edition)

a) $a_{31}=0, a_{24}=-1,a_{14}=2, a_{32}=2,a_{21}=7$ and $a_{34}= 4$ b) (1,4) and (3,2)
a) $a_{31}$ is the element lying in the $3^{rd}$ row and $1^{st}$ column and it is equal to 0. Similarly we can find the values of all the other elements. b) Entry lying in the $1^{st}$ row and $4^{th}$ column= Entry lying in the $3^{rd}$ row and $2^{nd}$ column = 2. So, the pairs are (1,4) and (3,2).