## anonymous one year ago I need help solving 5y-3/5=4/5, 11z/16+7z/8=5/16, a/20+4/15=9/15

1. LynFran

2. LynFran

whats the first step?

3. anonymous

4. LynFran

yes we can... we can also multiply the equation throughout by 5 leaving |dw:1442965991929:dw|

5. LynFran

now we add 3 to both sides we get 25y=7 y=7/25 in a similar way if we work its as it is we would get the same answer ..here |dw:1442966307794:dw|

6. anonymous

a little confusing but I get it

7. LynFran

ok any question before moving onto the 2nd problem ? |dw:1442966674753:dw|

8. anonymous

no

9. LynFran

ok we must first find the LCM

10. LynFran

lowest common multiple

11. anonymous

16?

12. LynFran

|dw:1442966977110:dw|

13. LynFran

8 into 16=2 so 2*7z=14z

14. LynFran

now 11z+14z=??

15. anonymous

24z

16. LynFran

|dw:1442967219579:dw|multiply both sides by 16...we get 24z=5

17. LynFran

whats the next step??

18. anonymous

divide each side by 24

19. LynFran

correct

20. anonymous

so z equals 4.8?

21. anonymous

or is it 0.21

22. LynFran

wait we made an error 11+14=25 and not 24

23. anonymous

oh

24. LynFran

|dw:1442967606687:dw|

25. LynFran

so 25z=5

26. anonymous

so z equals 0.2 then

27. LynFran

correct or 1/5 in fraction form

28. LynFran

|dw:1442967739184:dw|what a=?

29. anonymous

yep

30. anonymous

a equals 1.8?

31. LynFran

nope

32. anonymous

im lost

33. LynFran

|dw:1442968005511:dw|

34. anonymous

so a equals 1/3

35. LynFran

no 20/3

36. anonymous

oh

37. LynFran

yep