Answer:
z=28
Explanation:
6=1/4z-1
1) take the -1 over to the other side of the equation, so it becomes +1
2) 6+1=7, so your new equation is 7=1/4z
3) to get "z" on its own, you'll have to time the 7 by 4 which is 28
4) your equation is now 28=z and that is your answer.
You can check by inserting 28 instead of z into the equation and it gives you 6. E.G. 1.4 X 28 -1 =6