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Question
x + 2y =8 এবং 2x +y =7 সরল রেখা দুইটির ছেদবিন্দু কোনটি?
(8,0)
(6,1)
(4,2)
(2,3)
ANSWER : 4
Descrption
<pre> দেওয়া আছে, x + 2y = 8 .... (i) 2x + y = 7 .... (ii) (i) নং কে 2 দ্বারা গুণ করে (i) নং হতে (ii) নং সমীকরণ বিয়োগ করে পাই, 2x + 4y = 16 2x + y = 7 3y = 9 ∴ y = 3 y এর মান (i) নং এ বসিয়ে পাই, x + 2.3 = 8 বা, x = 8 - 6 ∴ x = 2 ∴ (x,y) = (2,3) </pre>
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