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It means you should rearrange the equation so that x is on one side of the equal sign, and everything else on the other, with no "x" on the right side of the equation.

For instance, if I was told to express x as a function of y and given the equation:

x-4y=6

I would express x as a function of y by rearranging the equation to read:

x = 6+4y

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Q: What does express x as a function of y mean?
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