1.

The number of solutions of 3x+y = 243 and 243x-y = 3 is (a) 0(b) 1(c) 2(d) infinite

Answer»

Correct answer is: (b) 1

3x+y = 243 = 35

So x + y =5----------(1)

243x-y = 3

(35)x-y = 31

So 5x -5y =1---------(2)

Since : \(\cfrac{a_1}{a_2}\neq\cfrac{b_1}{b_2}\), so unique solution



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