Mashaal Masha
$y=2x+1$

$y=ax-8$

In the system of equations above, $a$ is a constant. If the system of equations has no solution, what is the value of $a$?
Difficulty: Hard
A: 

$-\dfrac{1}{2}$

B: 

$0$

C: 

\(1\)

D: 

$2$

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