## erniellyd28 3 years ago 11z-3-7z=9

1. Rosh007

mmm what is (11-7)z =

2. erniellyd28

4

3. Rosh007

yes... 11z-3-7z=9 means (11-7)z-3 = 9 which gives 4z-3 = 9; Now do you want to solve for z?

4. erniellyd28

thats where i get stuck

5. erniellyd28

3 to get 9?

6. erniellyd28

sorry my message didnt sent completely

7. erniellyd28

do i find a number to multiply

8. erniellyd28

do i find a number to multiply 4 with and then subtract it from 3 to get 9?

9. Rosh007

well let us get moving fromwher you got stuck..... equality has a property that if you add or subtract or multiply or divide by same number on both side of equality the result won't be altered.... so.... that is a+b =x is same as a+b+c= x+c a+b-c= x-c (a+b)*c= x*c (a+b)/c = x/c

10. Rosh007

yes you can find a number which satisfies your rlation by using above property of equality

11. Rosh007

any idea how?

12. erniellyd28

4 times 3 =12-3=9?

13. Rosh007

How you got 4 times 3??

14. erniellyd28

4z= 4(3)=12 or am i wrong

15. Rosh007

yes... the method you followed is a round about way...but there is an alternate simple 100% guarntry way using the above property wanna learn it?

16. erniellyd28

17. Rosh007

:) so aftr simplification of 11z-3-7z=9 we got 4z-3 = 9 now add 3 to both sides of equality ( the result will not change because of the property a+b =x is same as a+b+c= x+c) what you get

18. erniellyd28

12

19. Rosh007

20. Rosh007

means both RHS and LHS

21. erniellyd28

rhs? lhs?

22. Rosh007

means RHS = Right Hand Side LHS = Left Hand Side of equation

23. erniellyd28

im so lost im very sorry

24. Rosh007

in this equation a+b =x a+b is LHS x is RHS