## tonipoo610 2 years ago how do you identify a slope on a coordinate graph?

1. blurbendy

You take two points on the line made by the slope. Then calculate the slope by taking (Y2 - Y1) / (X2 - X1) The slope is the ratio between the difference in the two y points and the difference in the two x points.

2. tonipoo610

so on my homework it says rise: -5 and run:-5

3. tonipoo610

i dont understand what that means i am only in 7th grade lol

4. blurbendy

You know when you look at the coordinate graph you have numbers on the x-axis and numbers on the y-axis?

5. tonipoo610

yes

6. blurbendy

Okay, on the x-axis, move over 5 "spaces", then go up 10 "spaces"

7. tonipoo610

but why ten because the rise is-5 and the run is -5

8. blurbendy

Yes, but we need to different points in order to calculate the slope of a line.

9. blurbendy

So now we have (5, 10) and (-5,-5) okay?

10. blurbendy

two*

11. tonipoo610

ok

12. blurbendy

Y2 - Y1 / X2 - X1 just means this: Take the SECOND y-point from (5, 10) and (-5, -5) which is -5 and subtract it from the FIRST y-point from (5, 10) and (-5, -5) which is 10

13. blurbendy

so we end up with -5 - 10 = -15 Do you follow so far?

14. tonipoo610

i do but i don't understand how you got 5 and 10 from

15. blurbendy

It's just a point I made up so that we can take the slope of a LINE (you need two points in order to do this). I'll come back to your question in a second (it will make sense trust me :) )

16. tonipoo610

yeah i get this but on my homework i just don't know where to get the other pairs cuz it doesn't tell

17. blurbendy

Oh, I see.

18. blurbendy

So it just says rise = -5, and run = -5?

19. blurbendy

They got those numbers from doing what we're doing Y2 - Y1 / X2 - X1. It looks like that is already solved for you!

20. blurbendy

So that means we have -5 / -5

21. blurbendy

and the slope is the ratio of RISE / RUN

22. blurbendy

So the slope = 1 !!! Understand?

23. tonipoo610

ohhhhh thxxxxx