## anonymous one year ago Help ????

1. anonymous

@calculusxy

2. Michele_Laino

question #23 hint: we have to find the slope of line D first

3. anonymous

ok

4. calculusxy

Find the slope of Line D and to find the slope of the perpendicular line, take the negative reciprocal.

5. calculusxy

... of the slope

6. anonymous

okZZ>?

7. Michele_Laino

the slope m, of line D, is: $\Large m = \frac{{6 - 1}}{{5 - 1}} = ...?$

8. anonymous

5/4

9. calculusxy

Find the reciprocal of 5/4

10. Michele_Laino

correct! now the requested slope m1, is given by thie condition: $\Large {m_1} \cdot \frac{5}{4} = - 1$

11. calculusxy

...then stick a negative sign.

12. Michele_Laino

the*

13. anonymous

okay so for the number 3 ths answer is um B OR A right????

14. calculusxy

ya

15. Michele_Laino

only one is the correct option

16. calculusxy

But what is the reciprocal of 5/4?

17. anonymous

is the answer A??? @Michele_Laino

18. Michele_Laino

no, I'm sorry, option A is a wrong option

19. anonymous

THEN b

20. calculusxy

yes but do you know why?

21. anonymous

well of all the answers that you have gave me i new that it needed to be a or b !?:?

22. Michele_Laino

If I multiply both sides of my equation by 4 , I get: $\Large {m_1} \cdot 5 = - 4$ please divide both sides by 5, what do you get?

23. calculusxy

Remember that finding the perpendicular line of a line that we already know, we need to find the slope first (of the original line). Then, we have to find the reciprocal (a/b -> b/a) and finally put a negative sign next to it (that's why it's called negative reciprocal).

24. anonymous

oh okay i did not know that @calculusxy