Question

4z-10=10 what do i solve for z

Answer 1

Answer:

z = 5

Step-by-step explanation:

To solve for z, means to get z all by itself on one side of the equation. In your equation z has had two things done to it. First, z has been times by 4, then 10 is subtracted. So, you "un-do" that in reverse order.

FIRST, add 10. To reverse or "un-do" subtracting.

4z - 10 = 10

4z -10+10 = 10+10

4z = 20

Then, divide by 4 to reverse the multiplying.

4z/4 = 20/4

z = 5

see image.

Also, you can check you answer.

put in 5 in place of z and be sure that you get a true statement.

4(5) - 10 = 10

20 - 10 = 10

10 = 10 Checked!

Answer 2

Answer:

$z=5$

Step-by-step explanation:

First, substitute in 5 for z: $4(5) -10=10$

Since $4*5=20$, we can now simplify the equation to $20-10=10$.

Now, check the equation to make sure that the value of z is correct. Do this by subtracting $20-10$ to see if it results in a solution of 10.

Since the equation $20-10=10$ is equal/true, we can conclude that $z=5$.