যদি 5xy + 28x - 2 = 0 এবং y = -4 হয়, তাহলে 4x + y = কত?   

A

B

C -3 

D

Solution

Correct Answer: Option C

  5xy+28x-2 = 0 

বা, 5x(-4)+28x - 2 = 0 

বা, -20x+28x-2 = 0 

বা, 8x = 2         বা, \(x = \frac{2}{8} = \frac{1}{4}\)         বা, \(4x + y = 4.\frac{1}{4} + ( - 4) = 1 - 4 =  - 3\)

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