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To plot y = 2x/3, mark the origin, O, on the Cartesian plane.

Think of any multiple of 3. Call this value a. Calculate 2*a/3 and call this value b. Let P be the point (a, b).

Join OP and extend in both directions.

Incidentally, a need not be a multiple of 3, but the calculations are simpler if it is.

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Q: How do you graph the function y equals 2 thirdsx?
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