Help with some math problems

1. Which of these pairs of points defines a line with a slope of -1?
A. (3, 10) and (3, 5)
B. (3, 10) and (5, 3)
C. (10, 3) and (15, -2)
D. (10, 3) and (3, 5)

2. Which fraction equals the ratio of rise to run between the points (2, -3) and (-5, -4)?

3. What is the ratio of rise to run between the points (0, 4) and (5, 6)?

8. What is the slope of the line containing (6, -7) and (5, -9)?

Hi,

1. Which of these pairs of points defines a line with a slope of -1?
A. (3, 10) and (3, 5)
B. (3, 10) and (5, 3)
C. (10, 3) and (15, -2) <==ANSWER

-2 - 3 . . . . -5
----------- = ------- = -1
15 - 10 . . . . 5


D. (10, 3) and (3, 5)

2. Which fraction equals the ratio of rise to run between the points (2, -3) and (-5, -4)?

-4 - (-3) . . . -1 . . . 1
------------- = ------ = ----- <==ANSWER
-5 - 2. . . . . -7 . . . 7


3. What is the ratio of rise to run between the points (0, 4) and (5, 6)?

6 - 4
--------- = 2/5 <==ANSWER
5 - 0


8. What is the slope of the line containing (6, -7) and (5, -9)?

-9 - (-7) . . . -2
------------- = ------ = 2 <==ANSWER
5 - 6 . . . . . -1

I hope that helps!! :-)

1) ans C
2) i dont know rise to run
3) rise to run??
4) 2