Using linear equations, it is found that it has exactly one solution with a = 8, given by option A.
-------------------
A linear equation has the following format:
[tex]y = ax + b[/tex]
- If two equations have the same value of a, they are parallel, that is, they never meet, and a system of equations involving them has no solutions.
- If they have different values of a, they meet once, and thus the system has one solution.
-------------------
The lines are:
[tex]6x - 14[/tex]
[tex]ax + 7 - 3x = (a - 3)x + 7[/tex]
It has exactly one solution if:
[tex]a - 3 \neq 6[/tex]
[tex]a \neq 9[/tex]
Thus, it has exactly one solution with a = 8, given by option A.
A similar problem is given at https://brainly.com/question/13967935