To find the solution for the system of linear equations y = 3x + 8 and y = 3x - 4, we can set the two equations equal to each other:
3x + 8 = 3x - 4
By subtracting 3x from both sides of the equation, we get:
8 = -4
However, this equation is not possible since 8 cannot be equal to -4. This means that there is no solution that satisfies both equations simultaneously.
Therefore, the correct answer is D. No solution.