Recall that

There are three cases to consider:
(1) When

, we have

and

, so

(2) When

and

, we get

and

, so

(3) When

, we have

and

, so

So
-10369
too lazy but that's the exact value
-3/2
slope = rise/run
We can use the two points to calculate rise (y value change) and run (x value change)
slope = (-6)/4 = -3/2
Just remove the parenthesis since you are adding them and combine like terms
x+5+2x+3
3x+8