Equality Example

Zero Plus a

Zero Plus a 2

Transitive Property of Equality Variation 1

Divide Both Sides

Divide Substitute

Zero Plus a Equation

Subtract Same Sides

Subtraction Example

Transitive Property of Equality Variation 2

Subtract to Zero

Subtraction Example

Zero Numerator Property Example

Subtract Zero Example

Subtract Zero Example 2

Subtract Zero Example 3

Median of Trapezoid is Parallel

Proof: Subtraction Example

Let's prove the following theorem:

if x = a - a, then x = 0

Proof:

View as a tree | View dependent proofs | Try proving it

Given

1	x = a - a

Proof Table

#	Claim	Reason
1	a - a = 0	a - a = 0 (subtract_to_zero)
2	x = 0	if x = a - a and a - a = 0, then x = 0 (Transitive Property of Equality)

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