## anonymous one year ago Fan Testimonial and Medal! What is the slope of the line that passes through the points (1, 7) and (–4, –8)? What is the slope of the line that passes through the points (–2, 15) and (–8, –5)?

1. anonymous

Only the second line!

2. anonymous

If you can solve 1, then you can solve second one also..

3. Vocaloid

point slope formula: (y2-y1) = m(x1-x2) solve for m by using the points (x1,y1) and (x2,y2) by plugging in the values for x1,x2,y1, and y2

4. anonymous

i didn't line one is a different question lol

5. anonymous

I know, but they are one and the same concept based question. If you can find the slope of first, then by using same formula, you can find second one too. :P

6. anonymous

i didn't the first line is the wrong problem (the next question)

7. anonymous

Slope is given by: $Slope = \frac{y_2 - y_1}{x_2 - x_1}$

8. anonymous

so 3/17?

9. anonymous

How, show me first..

10. anonymous

y2-y1 =3 ------- x2-x1= 17

11. anonymous

Okay, what is y2 value and what is y1 value there?

12. anonymous

-5 minus -8

13. anonymous

|dw:1432839333715:dw|

14. anonymous

In first point (-2,15), first is x1 value and second is y1 value. In second point (-8,-5), first is x2 value and second is y2 value..

15. anonymous

Now plug in the values carefully..

16. anonymous

-20 ---- -3 6.66666

17. Vocaloid

not quite, check the denominator again

18. anonymous

How you got -3 in denominator?

19. anonymous

...

20. anonymous

-6?

21. anonymous

-5-15 = -20 this is okay.. Check your denominator once again.. -8 -(-2) = ??

22. anonymous

-6?

23. Vocaloid

yea, -6 is the denominator

24. Vocaloid

so, what is the slope?

25. anonymous

That is great..

26. anonymous

10 --- 3

27. anonymous

Good..

28. anonymous

but i put - 10 ----- 3. so i failed you can't miss one :/

29. Vocaloid

yup! 10/3 is the answer for the first problem do you think you can solve the second one on your own?

30. anonymous

@Vocaloid this is second one.. :P