Answer:
Step-by-step explanation:
In this question, we have to find the slope with the given coordinates.
To find our slope, we would use the slope formula: 
Plug in your coordinates and solve:

Simplify the fraction:

The slope would be 
Answer:
9
Step-by-step explanation:
2*2=4*2=8+2=10-1=9
I'd say 100 even, don't know if this is a real question or not.
Answer:
The answer is
.
Step-by-step explanation:
First, it is important to recall that the group law is not commutative in general, so we cannot assume it here. In order to solve the exercise we need to remember the axioms of group, specially the existence of the inverse element, i.e., for each element
there exist another element, denoted by
such that
, where
stands for the identity element of G.
So, given the equality
we make a left multiplication by
and we obtain:

But,
. Hence,
.
Now, in the equality
we make a right multiplication by
, and we obtain
.
Recall that
and
. Therefore,
.