## anonymous one year ago Challenge! Ready? What is the solution to the proportion, 3y-8/12= y/5? Show me your work so that I, Lolly, know you are not cheating. THIS IS A PROPORTION; where you cross multiply.

1. anonymous

This is not simple algebra.

2. DanJS

is [3y-8]/12 the left side...

3. DanJS

$\frac{ 3y-8 }{ 12 }=\frac{ y }{ 5 }$

4. anonymous

yes

5. anonymous

Sorry for not saying.

6. DanJS

ok, remember to group the numerator if multiple terms...

7. DanJS

so if you multiply both sides by a common denominator... in this case (12*5), you,,, nevermind just do the cross multiply thing 5*(3y-8) = 12*y

8. DanJS

can you distribute the 5 into that parenthesis term ?

9. anonymous

$\large \sf 15y-40=12y$$\large \sf 3y=40$$\large \sf y=\frac{40}{3}$ Right?

10. AbdullahM

Hint: $$\sf \Large\frac{a}{b} = \frac{c}{d} \to ad = bc$$ And this question as a challenge, and asking for work seems rather suspicious to me...

11. anonymous

MM. You guys are not getting it. : OO

12. anonymous

Are you saying I'm wrong?

13. anonymous

yup

14. AbdullahM

Could you please write this: 3y-8/12= y/5 using the equation button or the draw tool?

15. anonymous

I checked my work, and that's what makes the two sides equal...

16. anonymous

|dw:1436486836928:dw|

17. anonymous

lol that drawing

18. AbdullahM

If that is the proportion then @LegendarySadist is correct...

19. anonymous

|dw:1436486880595:dw|

20. anonymous

$\large \sf \frac{3(\frac{40}{3})-8}{12}~=~ \frac{40}{3 \times 5}$ $\large \sf \frac{40-8}{12}=\frac{40}{15}$$\large \sf \frac{32}{12}~=~\frac{40}{15}$$\large \frac{8}{3}~=~\frac{8}{3}$

21. anonymous

In what way am I wrong? I just proved my answer...

22. anonymous

Shoot man. I think you did do it right

23. anonymous

Im the one that did it wrong D:

24. zepdrix

buhaha, i hate when that happens c:

25. zepdrix

you forget to multiply the 8 and the 5 lolly? :3

26. anonymous

.....maybe 0-0

27. anonymous

lullll