the perimeter of a rectangle is 36 centimeters. its length is 11 centimeters. what is the rectangle's width?
2 answers:
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You used the fact that you can multiply both sides of an equality by the same, non-zero constant.
So, if you start with the trivial equality
you can multiply both sides by 3:
But if ,
becomes
, which is
. So, we have
which leads to
if you recall that