Mashaal Masha
$x$ $f(x)$
$1$ $-64$
$2$ $0$
$3$ $64$


For the linear function $f$, the table shows three values of $x$ and their corresponding values of $f(x)$. Function $f$ is defined by $f(x)=ax+b$, where $a$ and $b$ are constants. What is the value of $a-b$?
Difficulty: Hard
A: 

$-64$

B: 

$62$

C: 

$128$

D: 

$192$

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