Dexter runs around a track at 10 laps in 20 minutes. How many laps per minute is that?
2 answers:
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ANSWER
The substitution property of equality.
EXPLANATION
We know that:
and that
Since x=5 or 5=x , we can substitute x for 5 wherever we see x in the given equation.
When we do that, we obtain;
This is what we refer to as the substitution property of equality.