1.

If 3x + 5y = 44 and 10x–2y=16, what is the value of x? (a) 7 (b) 3 (c) 5.5 (d) 6.5 (e) None of these

Answer» (b) 3x + 5y = 44 ...(i)
10x – 2y = 16 ...(ii)
By equation (i) × 2 + equation (ii) × 5 we have
6x + 10y + 50x – 10y = 88 + 80
or, 56x = 168
x =168/56 = 3


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