1. amilapsn

Do you want the equation of the straight line?

2. anonymous

3. anonymous

thats the possable out comes.

4. amilapsn

$$m$$ is the gradient of the line, right? How do you find the gradient of a straight line?

5. anonymous

idk

6. triciaal

use the same formula for the other question the gradient is the same as the slope

7. anonymous

its D?

8. amilapsn

$$\Huge m={\frac{\text{y difference}}{\text{x difference}}}$$

9. anonymous

ya

10. amilapsn

nope...

11. amilapsn

so, $$\Huge m=\frac{y-(-6)}{x-4}$$ ok?

12. anonymous

ok

13. amilapsn

14. anonymous

-4?

15. amilapsn

I mean what's the option?

16. anonymous

Oh A

17. amilapsn

$\Huge \cal Bingo!$

18. anonymous

lol can you help on one more?

19. amilapsn

Yes sure.

20. anonymous

21. amilapsn

What is the slope of the graph?

22. anonymous

how do i find that?

23. amilapsn

take two points of the graph and plugin the values to $\Huge m={\frac{\text{y difference}}{\text{x difference}}}$

24. anonymous

the 2 points are 10 and - 10 right??

25. amilapsn

Not quite. If you choose a point then that point has two coordinates: (x,y) right?

26. anonymous

ya

27. amilapsn

So?

28. anonymous

thats 10 and -10 thats the x,y

29. anonymous

10 and -2?

30. amilapsn

It's one point. To calculate slope you've to choose two points:|dw:1439913690096:dw| Let's take point A and B. Can you tell me what's the coordinates of point A?

31. anonymous

4,-8?

32. amilapsn

nope. The coordinates of point A is (-8,6).. make sure to use brackets when writing coordinates. :) Can you try the coordinates of point B?

33. anonymous

-6,4

34. amilapsn

when you telling coordinates first you have to tell x coordinate. then you've to tell y coordinates.

35. anonymous

so 4,-6?

36. amilapsn

you got that. So what would be the slope of the graph?

37. anonymous

i dont know

38. anonymous

i think i got it is it C?

39. amilapsn

Let's put the equation of the slope this way: $\huge m=\frac {y_A-y_B}{x_A-x_B}$ Can you plugin the values?

40. anonymous

is it C?

41. anonymous

HELLO?!

42. amilapsn

yep.... Do you need more explanation?

43. anonymous

no