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The x-axis and the y-axis should always be perpendicular so that you can express any point in a 2-dimensional plane using an x value and a y value. They are perpendicular so that using them and visualizing is easier, so that x values have no impact on y values and vice versa, and so that formulas like the distance formula can be used. In general, right angles are much easier to work with than oblique or acute angles.

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Q: Why should x and y axis always be in 90 degrees?
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