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Raghav says the rule "a − b = b − a" is true because 4 − 4 = 4 − 4. Which choice shows he is wrong?

Class 6Rules and Formulas with VariablesAlgebra

A $a = 0, b = 0$
B $a = 7, b = 7$
C $a = 5, b = 5$
D $a = 9, b = 2$

Step-by-Step Solution

One example where it fails is enough: 9 − 2 = 7 but 2 − 9 is not 7. When a = b both sides are 0, so those choices do not test the rule.

Answer: D)

a = 9, b = 2

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