Question

You know that 12x=60, and that x=5. Which property of equality would you use to conclude that 12•5=60?

Answer 1

ANSWER

The substitution property of equality.

EXPLANATION

We know that:

$12x = 60$

and that

$x = 5$

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;

$12 \bullet \: 5 = 60$

This is what we refer to as the substitution property of equality.