Answer:
(x) =
, - 
Step-by-step explanation:
To find the inverse, interchange the variables and solve for y.
Hope this helps,
Davinia.
Answer:
69 420
Step-by-step explanation:
Now, let's do the same as we did for the previous one here.

notice again, how did we get 84 for the 4th element's coefficient? well 36 * 7 / 3. and so on. And you can just expand it from there.