Let's plot (0, 1) (0, 2) (0, 4) (0, −2) on the graph

All points in y-axis are like

(0, 1) (0, 2) (0, 4) (0, −2)

So x = 0 for all points in y-axis

∴ Equation of y axis is
**
x = 0
**

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