Question

Could you answer question 6 ?

Answer 1

`a=-3`

Explanation:

`"Given a matrix A then the inverse matrix is "A^-1`

`A=((a,b),(c,d))`

`rArrA^-1=1/(ad-bc)((d,-b),(-c,a))`

`"here "A=((-6,3),(4,6))`

`"the element a in "A^-1" is therefore "a=-3`