## anonymous 5 years ago How do you write an equation in slope intercept form for a line that passes through a certain set of points? And how do you do it if they tell you the x intercept, but not the y intercept? Thanks!

1. anonymous

slope =(y2-y1)/(x2-x1) slope intercept form = y=mx+b

2. anonymous

Ok, so you use the points in slope formula? But what if you're only given one set of points? Like if it said, slope -5, passes through (-3,-8) ? then how would you do the formula?

3. anonymous

use formula, $y-y_{1}=m(x-_x{1})$

4. anonymous

m=-5 y1=-8 x1=-3

5. anonymous

ok

6. anonymous

If I deserve medal then give me one

7. anonymous

u need help with equation?

8. anonymous

hold on one sec

9. anonymous

Thanks! ok how do I give you a medal haha?

10. anonymous

next my name click on good answer

11. anonymous

Oh wait, what if it's perpendicular?

12. anonymous

2 line intersect have angle 90 degree

13. anonymous

paralell never intersect

14. anonymous

Right, I know, so how would you put that in slope intercet equation?

15. anonymous

slope -5, passes through (-3,-8) ?

16. anonymous

No, if it says that it's perendicular to lik efor examle, y=3x-2

17. anonymous

let do this ffrist y-(-8)=-5(x-(-3)) y+8= -5(x+3) y= -5x-15-8 y= -5x -23

18. anonymous

Yes, I got that

19. anonymous

u want write anothe equation is perendicular to this line y=3x-2?

20. anonymous

yes, and passes through (6,-1)

21. anonymous

perendicular slope is flip and opposite side Example : slope = -1/3 than y-(-1)=-1/3(x-6) $y+1=\frac{-1}{3}( X)+2$$y=\frac{11x}{3}+2-1$$y=\frac{-1x}{3}+1$ $y=\frac{1x}{3}+1$perendicular to line y=3x-2 u can check by : produc of 2 slope is -1 then they are perendicular

22. anonymous

Thanks!

23. anonymous

$\frac{-1}{3}\times3=-1$ -1 yes they are perendicular

24. anonymous

25. anonymous

Thank you

26. anonymous

u forgot give me a medal

27. anonymous

How do I do that again?

28. anonymous

next my name click on good answer

29. anonymous

d u see?

30. anonymous

next may name right hand side

31. anonymous

It won't let me click on the medal symbolk though

32. anonymous

u see medal or good answer?

33. anonymous

click on give medal or good answer

34. anonymous

There is nothing that says that

35. anonymous

not thing next to my name? some one just give me

36. anonymous

never mind

37. anonymous

There is a medal symbol and it says 117, and then a shield and it says 10. I can't click on either of those. There is nothing else.

38. anonymous

next it says 10

39. anonymous

after it says 10

40. anonymous

this u see the box say good answe or give medal?