How can you plot a point using its x axis and y axis coordinates?

The best way to answer your question is by an example.

Let's say that you are given (2,6) and you need to plot them. 2 is your x value and 6 is your y value. On the x-axis go to the dash of the number value of 2, then go up 6 dashes, on the vertical line l, from the point of 2. If you have a negative x value, you go to the left hand side of the coordinate plane, if your y value is negative, go down rather than up. I hope you understand!

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Another contributor took a more generic and more mechanical approach:

-- Take a blank sheet of paper. Draw a horizontal line on it to represent the x-axis,
and a vertical line to represent the y-axis.

-- The point where the lines cross is the 'origin' that is (0,0). Starting with zero at the origin, mark off
distances on the two axes, just like rulers, in all four directions. Use positive numbers
starting at the origin and going up and to the right. Use negative numbers going down
and to the left.

To plot any point:

-- Look at the x-coordinate of the point. Starting at the origin, move your pencil
that distance horizontally ... to the right if the number is positive, or to the left
if it's negative. You wind up somewhere on the x-axis. Draw a tiny mark there.

-- Look at the y-coordinate of the point. Starting at your tiny mark on the x-axis,
move vertically the distance equal to the y-coordinate ... up if the number is positive,
or down if it's negative.

You wind up at the point described by those coordinates.

Using two numbers in this way, you can describe any point anywhere on the
sheet of paper, no matter how big the sheet is.

But ... you can't leave the flat sheet of paper. To do that, you'd need a third number,
which you would call the 'Z-axis coordinate'. That's a separate story; but if you've
followed this answer up to here, then you can probably figure out how the z-axis
works, and how three numbers can lead you to any point in the universe!