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
Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class