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a) Lines 1 and 2 assign the values of $x$ and $y$.

Line 3 reassigns a new value for $x$ by solving an equation involving the values in lines 1 and 2. This gives $x=\\simplify[basic,!collectnumbers]{{x}-{a}/{y}}$, therefore R has reassigned a new value for $x$. This is $x=\\var{{x}-{a}/{y}}$.

Line 4 shows a calculation involving $x$. This bit is designed to catch you out. We haven't reassigned $x$ as a new value here so this doesn't change our $x$ value.

Therefore the value of $x$ remains as $x=\\var{{x}-{a}/{y}}$.

b) Line 2 assigns the value of $y$.

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What is the value of $x$?

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{x-(a/y)}

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{x-(a/y)-b}

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{x}

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{x-b}

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What is the value of $y$?

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{y}

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{x}

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{x+y}

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{y+2}

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> x = {x} 
> y = {y} 
> x = x - ({a}/y) 
> x - {b} 
> x

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Advice section doesn't show up when you click reveal?

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