(4x - 9y, 3y - 2x) = (-2, -2) হলে x এর মান কত?
Solution
Correct Answer: Option A
4x - 9y = - 2 ..... (1)
3y - 2x = - 2 ..... (2)
(1) নং + (2) নং × 2
⇒ 4x - 9y + 6y - 4x = - 2 - 4
⇒ - 3y = - 6
∴ y = 2
(1) নং থেকে
⇒ 4x - 18 = - 2
⇒ 4x = 16
∴ x = 4
3y - 2x = - 2 ..... (2)
(1) নং + (2) নং × 2
⇒ 4x - 9y + 6y - 4x = - 2 - 4
⇒ - 3y = - 6
∴ y = 2
(1) নং থেকে
⇒ 4x - 18 = - 2
⇒ 4x = 16
∴ x = 4
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