Question

For any two integers x and y, which of the following suggests that operation of addition is commutative ?

(A) x + y = y + x (B) x + y > x

(C) x – y = y – x (D) x × y = y × x

Answer 1

(A) x + y = y + x

Let us assume a and b are the two integers,

Then, commutative law of addition = a + b = b + a

Where, a = x, b = y

Therefore, commutative law of addition = x + y = y + x