Let us plot points (1, 0) (2, 0) (4, 0) (−2, 0) on the graph

All points in x-axis are like

(1, 0) (2, 0) (4, 0) (−2, 0)

So y = 0 for all points in x − axis

∴ Equation of x axis is
**
y = 0
**

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