what is the equation of the x axis
Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/whatis-the-equation-of-1-x-axis-2-y-axis/linear-equations-in-two-variables/9716081
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https://www.meritnation.com/ask-answer/question/whatis-the-equation-of-1-x-axis-2-y-axis/linear-equations-in-two-variables/9716081
Regards