Question

how to do 2z+4=12 plz show how you got it

Answer 1

2z + 4 = 12

2z = 12 - 4

2z = 8

z = 8/2

z = 4

Answer 2

2z + 4 = 12

We're simply just trying to isolate z.

So, we must get z onto it's own side of the equal sign :)

Our first step is to subtract 4 from both sides.

2z + 4 - 4 = 12 - 4

Simplify.

2z = 8

Then, we divide both sides by 2.

$\dfrac{\cancel{2}\text{z}}{\cancel{2}} = \dfrac{8}{2}$

Simplify.

z = 4

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To check your work, simply plug in the value of z into z in the original equation.

In this problem, z = 4, so plug in 4 for z.

2z + 4 = 12

2(4) + 4 = 12

Simplify.

8 + 4 = 12

12 = 12

Therefore, z = 4