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a) Line 1 assigns $x=\\var{a}$. The third line just involves a calculation using $x$ but no reassignment.

\n

b) $z=x - y$. 

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What is the value of $x$?

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{a}

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{a*b - a}

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{b - a}

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{b}

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What is the value of $z$?

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{a - b}

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{a}

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{2/b}

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{a*b - a - b}

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> x = {a} 
> y = {b} 
> (x*{b}) - {a} 
> x 
> z = x - y
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