2x + 3y =1এবং 5x-2y + 7= 0 সমীকরণদ্বয়ের সমাধান কত?

A    (1,1)

B    (3,4)

C    (–1, 1)

D    (2,-1)

Solution

Correct Answer: Option C

2x+3y =1.............. (i)
ও 
5x–2y+7= 0

Or, 5x-2y=-7......... (ii)

তাহলে,

(i)×5-(ii)×2

15у+4y=5+14

Or, 19y=19

∴ y=1

(ii) নং y এর মান বসিয়ে পাই,

5x-2×1=-7

Or, 5x=-7+2

Or, 5x=-5

x=-1

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