Question

explain how it comes​

Answer 1

Step-by-step explanation:

First draw a number line.

Then draw the coordinate axes

Now,what you have to do is since y=a,you have to mark any point a on the y-axis and draw a line passing through the point,that is through y=a you have to draw a line

When you look at the figure,you will se that y=a is parallel to x-axis.

The distance of y is 'a' (do remember it)

I sent you one attachment

Sorry for not using graph paper as due to lockdown no shops are open so I don't have any graph paper available at my home.I have drawn the graph in a two line copy.

Hope you understand