Write a proof for: “If
(HINT: Use Exercise 39 as a guide)
39. Provide reasons for this proof. “If
PROOF  
Statements  Reasons 
1.

1. ? 
2.

2. ? 
3.

3. ? 
4.

4. ? 
To find:
The proof for the given condition.
Given:
Property used:
1. The Subtraction Property of Equality states that if a number is subtract from one side of an equation then the same number must be subtracted from the other side of equation to maintain the equality of the original equation.
2. According to Substitution Property of Equality, if
Calculation:
The first statement of the proof should be the given part.
Therefore, the first statement for the proof is
Use Subtraction Property of Equality and subtract
Therefore, the second statement of the proof is
In the right side of the final equation, it is only
Therefore, the third statement of the proof is
To reach the final statement, use second statement.
Use Substitution Property of Equality and substitute
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