Answer: The slope is 
Step-by-step explanation:
The slope can be calculated with the following formula:

Then, knowing that the line passes through the points (2,1) and (-1,-1), we can substitute the coordinates into the formula.
In this case:

Therefore, the slope of the line that passes through the points (2,1) and (-1,-1) is:

Answer:
Step-by-step explanation:
He collected a total of 225 stamps. If 88% of the stamps he collected were foreign, how many other stamps did he collect?
Answer:
a = 6
Step-by-step explanation:
-6(2 + a) = -48
it is basically 2 steps
Divide by -6 first
(2 + a) = -48 / -6
2 + a = 8
minus the 2
a =6