Question

How do you solve `z/2.8 = -6.2`?

Answer 1

Multiply both sides of the equation by `2.8` to get:

`z = -6.2 * 2.8 = -17.36`

Explanation:

The truth of an equation is preserved by any of the following operations:

(1) Add or subtract the same value on both sides.
(2) Multiply or divide both sides by the same non-zero value.

Note that you can also do things like square both sides of an equation, but this can introduce spurious solutions: that is the new equation may have solutions that the old one does not.