Question

After you add both sides by 9. How can you solve for 5z in this equation
5z-3=12

Answer 1

OPTION A: Divide both the sides by 5

Explanation:

We are given: 5z - 3 = 12

When we add 9 to both sides we get:

5z - 3 + 9 = 12 + 9

⇒ 5z + 6 = 21

⇒ 5z = 21 - 6 = 15

⇒ 5z = 15

To find the value of z we have to divide both the sides by 5.

i.e.,
`$ (5z)/(5) = (15)/(5) $`

⇒ z = 3.