If x = a, y = b is the solution of the equations x - y = 2 and x + y = 4, then the values of a and b are respectively,

1. 3 and 5

2. 5 and 3

3. 3 and 1

4. -1 and -3

A pair of linear equations which has a unique solution x = 2, y = -3 is

1. x + y = -1
   2x - 3y = -5

2. 2x + 5y = -11
   4x + 10y = -22

3. 2x - y = 1
   3x + 2y = 0

4. x - 4y - 14 = 0
   5x - y - 13 = 0

Consider the following two statements.

Statement 1: A solution to linear equation 5x - 2y = 1 is x = 3, y = 7.

Statement 2: The linear equation 5x - 2y = 1 has a unique solution.

Which of the following is valid?

1. Both the statements are true.

2. Both the statements are false.

3. Statement 1 is true, and Statement 2 is false.

4. Statement 1 is false, and Statement 2 is true.