How do you solve #15 - z = 6#?

1 Answer
Jun 10, 2018

Answer:

#z = 9#
#15 - 9 = 6#

Explanation:

#15 - z = 6#

The goal of this equation is solve for the value of the variable, #z#. This is a one-step problem. To do this, we want to make #z# by itself to find its value. Because #15# is also on the same side, and we only want #z#, we'll subtract #15# to cancel out positive #15#.

Because we subtract #15# to one side, we'll have to subtract #15# from the other side. So, you're left with this:

#-z = -9#

Because you can't have a negative variable, divide by #-1# to make the equation positive. Recall that two negatives create a positive, so:

#z = 9#

Confirm that this is right by plugging it into your equation:

#15 - z = 6#
#15 - 9 = 6#
#6 = 6#

This is correct.