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Question
If x = −1, y = 2 is a solution of the equation 3x + 4y = k, find the value of k.
Solution
Given that
3 x + 4 y = k
It is given that x = - 1 and y = 2 is a solution of the equation 3x + 4 y = k
∴ 3 × (- 1) × 4 × 2 = k
⇒ - 3 + 8 = k
⇒ k = 5
⇒ k = 5
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