Question 227259
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If you are <b><i>subtracting</i></b> equal values from equal values, then you are using the Subtraction Property of Equality.  However, I NEVER use the Subtraction Property of Equality, and you don't have to either.  That's because:


If XY = ZW, then XY + (-RS) = ZW + (-RS) is a statement that expresses the EXACT concept that your statement does, and is true because of the <b><i>Addition</i></b> Property of Equality.


If you always use one rule, you can't ever get confused.  I never divide either -- I multiply by the reciprocal.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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