What do you need to do to obtain y=- 2 from y+7=5?
Subtraction Property of Equality
Practice makes perfect
Let's examine the given statement and determine the property that justifies the statement.
If y+7=5, then y=- 2.
In order to obtain y=- 2 from y+7=5, we subtract 7 from both sides of the equation.
y+7 - 7=5 - 7 ⇒ y=- 2
Therefore, Subtraction Property of Equality justifies this statement.
If a=b, then a - c=b - c.
