Q2 of 34 Page 170

Taking different numbers as x, y and compute x + y, x – y. Check whether the following hold for all kinds of numbers.

(x – y) + y = x

(x – y) + y = x

Let’s check for x = 1 and y = -1


L.H.S = (1 – (-1)) + (-1)


= (2) – 1


= 1


R.H.S = 1


= L.H.S


Hence, it works for x = 1 and y = -1


Let’s check for x = 2 and y = -2


L.H.S = (2 – (-2)) + (-2)


= (4) -2


= 2


R.H.S = 2


= L.H.S


Hence, it works for x = 2 and y = -2


Similarly we can check for other values too. It will follow.


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