## anonymous one year ago If p varies directly with q, and p = 10 when q = 2, what is the value of p when q = 20? A. p = 28 B. p = 100 C. p = 1 D. p = 40

1. Nnesha

what 's the equation for direct variation ??

2. anonymous

i dont remember and i suck at it

3. Nnesha

direct variation y = kx y varies directly with x :-)

4. anonymous

Well it is just a ratio

5. anonymous

okay yeah i remember that now

6. Nnesha

alright so p varies directly with q write an equation

7. anonymous

Don't you just multiply p•5?

8. anonymous

100?

9. Nnesha

nope what's the equation p varies directly with q ?

10. Nnesha

y varies directly with q y = kx now replace y by p and x by q

11. anonymous

whaaaaaa

12. anonymous

$10=k2$ ?

13. anonymous

?

14. Nnesha

sorry intnt gt disconnected

15. Nnesha

that's right solve for k

16. anonymous

k=5?

17. Nnesha

right $\huge\rm p=2q$ substitute q value solve for p

18. anonymous

okay so what would it be when its 20?

19. Nnesha

yes right

20. anonymous

?

21. Nnesha

ohh sorry i thought u said q would be 20 .-.

22. Nnesha

so replace q by 20 solve for p

23. Nnesha

$$\color{blue}{\text{Originally Posted by}}$$ @Nnesha right $\huge\rm p=2q$ substitute q value solve for p $$\color{blue}{\text{End of Quote}}$$ q=20 plug in

24. anonymous

40!

25. anonymous

@Nnesha ?

26. Nnesha

yes

27. anonymous

thanks:)