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Lines Parallel to Coordinate Axes

23. Is it man...

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23. Is it mandatory that we can only take x and y as variables (I'm asking about linear equation in two variables) ? Can't we take p, q or any other alphabet as a variable? If we can take any alphabet as variables the what is about the ordered pair in which we write value of variable x first the y?

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Lines Parallel to Coordinate Axes

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