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

1 Answer
Jun 20, 2015

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

#z = -6.2 * 2.8 = -17.36#


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.