Consistent pair of LE

Q.

What do you mean by unique solution in linear equations?

Q. The number of values of k for which the system of equations $(k+1)x+8y=4k$
$kx+(k+3)y=3k-1$ has infinitely many solutions, is

1. 1
2. 2
3. infinite
4. 0

Q. Select the pair of equations that are consistent.

1. x+y=1, 2x+2y=2
2. 3x+3y=3, 2x+2y=2
3. 4x+4y=4, 2x+2y=2
4. x+y=1, 2x+2y=4
5. 5x+5y=5, 2x+2y=2
6. 6x+6y=6, 2x+2y=2
7. x+y=1, 7x+7y=7
8. x+y=8, 2x+2y=2

Q. The pair of linear equations $13x+ky=k$ and $39x+6y=k+4$ has infinitely many solutions if:

1. k = 1
2. k = 4
3. k = 6
4. k = 2