Question

If the pair of linear equations x – y = 1, x + ky = 5 has a unique solution x = 2, y = 1, then the value of k is ______.

Options

• – 2

• – 3

• 3

• 4

Answer 1

If the pair of linear equations x – y = 1, x + ky = 5 has a unique solution x = 2, y = 1, then the value of k is 3.

Explanation:

We have,

`\implies` x – y = 1 and x + ky = 5

x = 2 and y = 1

`\implies` 2 + k = 5

`\implies` k = 3