## anonymous 5 years ago 8m-16 ÷ 3m-6 -20 40

1. asnaseer

I am not sure I understand you question - can you please clarify?

2. asnaseer

is this:$(8m-16)\div(3m-6)$with two choices for the answer: -20 or 40?

3. anonymous

no the 20 should have a line above it but under the 8m-16 and the same with the 40 and 3m-16

4. asnaseer

ok, so question is:$\frac{8m-16}{20}\div\frac{3m-6}{40}$correct?

5. anonymous

yes it wouldnt let me type it like that but thats correct

6. asnaseer

ok, do you the rule for dividing fractions? i.e. this rule:$\frac{a}{b}\div\frac{p}{q}=\frac{a}{b}\times\frac{q}{p}$

7. asnaseer

*do you know the rule...

8. anonymous

yes

9. asnaseer

so we can make use of this to get:$\frac{8m-16}{20}\div\frac{3m-6}{40}=\frac{8m-16}{20}\times\frac{40}{3m-6}$

10. asnaseer

you can also factorise a bit to get:$\frac{8m-16}{20}\times\frac{40}{3m-6}=\frac{8(m-2)}{20}\times\frac{40}{3(m-2)}$

11. asnaseer

you now be able to cancel some things out. are you able to work it out yourself from here?

12. anonymous

ok once i cancel out the m-2 i get lost

13. anonymous

bec ause the 20 is negative

14. asnaseer

ok, let me show you the steps...

15. asnaseer

oh - so the equation I wrote was not correct?

16. anonymous

im sorry i thought u put a -20

17. asnaseer

are you saying it should be:$\frac{8(m-2)}{-20}\times\frac{40}{3(m-2)}$

18. anonymous

yes

19. asnaseer

ok , I'll try and illustrate the steps to you...

20. asnaseer

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21. asnaseer

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22. asnaseer

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23. anonymous

omg thanks so much..... i just have one more problem that im stuck on

24. asnaseer

so you end up with:$\frac{8}{-1}\times\frac{2}{3}=\frac{16}{-3}=-\frac{16}{3}=-5\frac{1}{3}$

25. asnaseer

just post your new question to the left and I'm sure there will be lots of people willing to help. unfortunately I need to leave now otherwise I would have assisted you.

26. anonymous

thanks though

27. asnaseer

yw