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Question
If (2, −5) is the solution of the equation 2x − ky = 14, then find k = ?
Solution
(2, – 5) is the solution of 2x – ky = 14.
Substituting x = 2, y = – 5 in 2x – ky = 14, we get
2(2) – k(– 5) = 14
∴ 4 + 5k = 14
∴ 5k = 14 – 4 = 10
∴ k = `10/5` = 2
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