3x + 2y = 7 এবং 2x = y হলে (x,y) হবে—

A (2,1)

B (3,1)

C (1,2)

D (-1, -2)

Solution

Correct Answer: Option C

2x=y

or, x=y/2--------(i)

 

So, 3(y/2) + 2y = 7

or, 3y/2 + 2y=7

or, (3y+4y)/2 =7

or, 7y/2=7

or, y=14/7

or, y=2

 

y এর মান (i) নং সমীকরণে বসাই,

x=2/2

or, x=1

 

সুতরাং, (x,y)=(1,2) Ans.

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