mental math i realy need help

Question

1) x/2=8

2) z-7=6

Answer 1

You have to perform the opposite operation fromt he one in the equation. For example:

 

x+2=8          Since +2 is on the same side as the x, -2 is the operation you need to do to get rid of it. Anything you do on one side you must do on the other, so...

 

x+2=8

  -2    -2

x=6

 

so for number 1:

x/2=8

*2    *2

x=16

 

And for number 2:

z-7=6

 +7  +7

z=13