Q5 of 37 Page 195

If and c ∝ d, let us write the relation of variation between a and d.

Given:


It can be written as,



Put the value of b in a,



Now, put the value of c in a,


We get,





This is the required relation between a and d.


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5

If x ∝ y, let us show that x + y ∝ x – y.

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let us show that A ∝ B.

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If x + y ∝ x – y, let us show that

x2 + y2∝ xy