It's a hexagon.
The formula of the sum of internal angles in the polygon:

Therefore

The x intercept would be -3 I believe, please mark me as brainliest if this helps and comment if you would like an explanation
Me no understand spanish buddy
You could interpret them as system of equation and answer the question easily
from A
-4x + y + x + w =1
write in same form from A
as this system has five variables and four of them are unknowns it means the unique solution is not possible
So, det (A) = 0