Step-by-step explanation:
A.
x = 2y - 8
3x - 6y = -12
3 (2y - 8) = - 6y = - 12
No solution for x.
x = 2y -8
- 24 = - 12
- 12 = - 24
Since 12 isn't equal to 24, there are no solutions.
B.
The two lines are combined into one. Means that there are many solutions. They are called coincident.
