যদি x+y+4 = x-y-12 = 0 হয়, তবে 2x+y = কত?
Solution
Correct Answer: Option D
x+y+4 = x - y - 12 = 0
অর্থাৎ , x + y + 4 = 0
বা, x + y = -4 ....(i)
এবং x - y = 12 ......(ii)
(i) ও (ii) যোগ করে,
2x = 8
x = 4
(i) নং-এ x-এর মান বসিয়ে-
4 + y = -4
বা, y = -4 -4
y = -8
এখন, 2x + y = 2 x 4 + (-8) = 8 - 8 = 0
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