## anonymous 5 years ago Hi, I totally forgot how to do line and slope, can someone help me out???

1. anonymous

how do you want to be helped? do you have example problems?

2. anonymous

Well, the first point on the graph is 1,2, the second is 0,-2

3. anonymous

okay do you know how to find the slope of the line given two points?

4. anonymous

no, that's why I'm here

5. anonymous

mmk, i'm just asking

6. anonymous

formula for slope is change in y over change in x

7. anonymous

so slope would be (-2 -2) / (0 - 1) which comes out to be 4 so the slope is four

8. anonymous

oh, I get it now, I was looking online, but everything was too comlicated, thanks for the help

9. anonymous

now we have the formula for a line y = mx + b where m is the slope and b is the intercept put slope in y = 4x + b we are also given two points, since both points are on the line, you can pick either say we pick the first one, plug it in for x and y 2 = 4(1) + b b = -2 line is y = 4x - 2

10. anonymous

sure thing

11. anonymous

that works, okay, that totally helps with homework, I'm glad i found this site

12. anonymous

cheers

13. anonymous

thanks for the help

14. anonymous

no problem

15. anonymous

alright, i have another question

16. anonymous

hello????????

17. anonymous

18. anonymous

so if the equation is (3,-2), (0,-3) then u would switch it around to (0,-2), (3,-3)????

19. anonymous

??????

20. anonymous

just because we are live, doesn't mean we are going to respond instantly you can't switch them because you would be changing the points

21. anonymous

then wat? I don't get it then.

22. anonymous

then you find the slope, like we did in the first question change in y over change in x

23. anonymous

i still don't understand, i'm only in 7th grade

24. anonymous

the question is find a line between (3,-2), (0,-3) so find the slope change in y over change in x (-3 - -2)/ (0 - 3) slope is 1/3 understand this?

25. anonymous

wait, so its kinda like subtracting

26. anonymous

yes slope formula is $\frac{x1 - x2}{y1 - y2}$ is this more clear?

27. anonymous

i totaly get it now, OH, we did this last year in school, thanks!!!! (:

28. anonymous

lol no problem good luck

29. anonymous

thanks