Question

If (2, −5) is the solution of the equation 2x − ky = 14, then find k = ?

Answer 1

(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