Question

If the point (2, -2) lies on the graph of the linear equation 5x + ky = 4, find the value of k.

Answer 1

It is given that  ( 2, 2 ) is a solution of the equation  5x + ky = 4 

∴ 5 × 2 + k × ( -2 ) = 4 

⇒ 10 - 2k = 4 

⇒ - 2 k = 4  - 10

⇒  -2k = - 6 

⇒ k = 3 .