What's an easy way to remember the X axis is horizontal and the Y axis is vertical?

The Y has a vertical line in it , the X does not .

good luck as that is geometry and might be a challenge for 3rd graders .

Is The X Axis Horizontal

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The equation of a line given two points: There are many ways to do this, but in your case the easiest is: Since you have the point (0,6), you have the y intercept (where your equation crosses the y axis). The easiest way to write the equation would be to use the slope intercept form y=mx+b where m is the slope and b is the y intercept. The point (0,6) tells you b = 6, since y = 6. Now you need m, the slope. To find slope, remember rise over run, or change in y over change in x. Your y's are 18 and 6 (from the points you gave, in (x,y) form), so your change in y is 18 - 6 = 12. your x's are 6 and 0, so 6 - 0 = 6. Rise over run, or change in y / change in x gives you 12 / 6, which simplifies to 2. Your equation would then be y = 2x+6, or, in terms of your above choices, y = 6 + 2x.

when we write ordered pairs, the horizontal coordinate comes first and then the vertical coordinate. this is natural if students have worked with number lines first (with just a horizontal coordinate)

so I point out that x, y are in alphabetical order. since x comes first alphabetically, it represents what we did on a number line, and so it is horizontal. the second variable, y, represents something new, the vertical coordinate.

On a completely different note, I once had a teacher who gave very wise advice about memorizing pairs of information. He said you will get less confused if you just memorize one of the pair. For example, just memorize "x is horizontal". What y represents will follow logically. But if you memorize that one is horizontal and the other is vertical, you can get mixed up.

When you get them to draw the Y axis have then put a small v at the top of the line so that it looks like a Y

I agree with Yaz slightly. I simply draw it like so with arrows:

For horizontal lines it would look like this

>---------------------<

Remove the line and you have >< an X.

For vertical lines it would look like this

v

|

|

|

^

Which creates a Y at the top.

So both lines actually create the letters they're associated with.

yeh think of the Y when u look at it the bottom is a vertical line!!!

For 3rd graders....and beyond

x to the left, y to the sky

Keep it simple!

X is a cross (across). Simples!

Can you hear the "rhymes?" x to the left and y to the sky.