X - The total cost
3 persons
Below $120 p/p
Then
120 * 3 = 360
X < 360/3
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.
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Answer:
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