Question

Name the property of equality that justifies: If x + 3 = 5, then x = 2.

Answer 1

Subtraction Property of Equality

From both sides of the equation x + 3 = 5, 3 was subtracted. That gave x +3 -3 = 5 - 3 which gives x = 2.

You could also argue that Addition Property of Equality is the property if you observe that subtracting 3 is the same as adding negative 3.