If 5xy + 28x - 16 = 0 and y = -4, what is the value of 2x + y?
Solution
Correct Answer: Option B
দেওয়া আছে,
5xy + 28x - 16 = 0
y = -4
y = -4 কে সমীকরণে বসিয়ে,
5x(-4) + 28x - 16 = 0
বা, -20x + 28x - 16 = 0
বা, 8x - 16 = 0
বা, 8x = 16
বা, x = 2
এখন x = 2 এবং y = -4 বসিয়ে,
2x + y = 2(2) + (-4)
= 4 - 4
= 0
5xy + 28x - 16 = 0
y = -4
y = -4 কে সমীকরণে বসিয়ে,
5x(-4) + 28x - 16 = 0
বা, -20x + 28x - 16 = 0
বা, 8x - 16 = 0
বা, 8x = 16
বা, x = 2
এখন x = 2 এবং y = -4 বসিয়ে,
2x + y = 2(2) + (-4)
= 4 - 4
= 0
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