## BioHazard9064 one year ago Help

1. BioHazard9064

Choose the equation that represents the graph below: A. y = -2x - 6 B. y = 2 over 3x + 6 C. y = -2 over 3x + 6 D. y = 2x + 6

2. Nnesha

y=mx+b is a slope intercept form where m is slope and b is y-intercept if line is increasing then slope would be POSITIVE if line is decreasing then slope would be NEGATIVE y-intercept is a point where line cross y-axis

3. Nnesha

line is increasing OR decreasing ?

4. BioHazard9064

Decreasing

5. Nnesha

so slope would be negative or positive ?

6. BioHazard9064

negative

7. Nnesha

great now look at the graph at what point line intersect the y-axis ?

8. BioHazard9064

6

9. Nnesha

so y = mx + b b= y intercept substitute b for 6

10. Nnesha

|dw:1440081626618:dw| slope = rise over run

11. BioHazard9064

OK so

12. BioHazard9064

Is it D?

13. Nnesha

|dw:1440081752851:dw| do you see triangles you should draw a triangle where line intersect the corner

14. Nnesha

slope = rise over run |dw:1440081848549:dw|

15. BioHazard9064

ok i don't fully understand

16. Nnesha

okay so have y = mx+6 and u know that slope would be negative right ?

17. Nnesha

now pick two points to find slope

18. Nnesha

|dw:1440081994974:dw| can we use those two points look at the graph where i draw a dot x=what y = what ?

19. Nnesha

|dw:1440082179347:dw| slope formula $\huge\rm \frac{ y_2 -y_1 }{ x_2-x_1 }$ now use these two poitns (0,6)(6,2) plug into the formula

20. BioHazard9064

so it would look like this? 0-2 _________ 6-6 am I right?

21. Nnesha

no (x,y)(0,6) first number represents x-coordinate 2nd one is y-coordinate so 0 is x or y ?

22. BioHazard9064

its the x

23. BioHazard9064

so it would look the same only the numbers are opposite

24. Nnesha

now y's should be at the top and x's at the bottom of the fraction so 0 shouldn't be there

25. BioHazard9064

so it would look like 6-6 ----- 0-6

26. BioHazard9064

no wait that 6 is supposed ti be a 2

27. Nnesha

|dw:1440083028882:dw| what is y_1and y_2 ? remember y's should be at the top

28. BioHazard9064

thy y's are 6 and 2

29. Nnesha

yes right so 2-6/6-0

30. BioHazard9064

2-6 is 4 and 6-0 is 6

31. Nnesha

no 2-6= ?

32. BioHazard9064

4 or -4

33. Nnesha

-4/6 negative cuz bigger number is negative now reduce the fraction -4/6= ? divide by 2

34. BioHazard9064

-2/3

35. Nnesha

yes right that's ur slope :)

36. BioHazard9064

ok so its between B and C

37. BioHazard9064

I Believe that B is the answer

38. Nnesha

y=mx+b what is ur slope ??

39. Nnesha

and what is y-intercept

40. BioHazard9064

-2/3 is the slope

41. BioHazard9064

and the y int is 6

42. Nnesha

yes so y = mx+ b replace m with -2/x and b with 6

43. Nnesha

i mean -2/3

44. BioHazard9064

y = -2/3x + 6

45. BioHazard9064

oh I forgot the - so it would be C

46. Nnesha

yep C

47. BioHazard9064

thanks

48. Nnesha

my pleasure