Don't use Caps please. They are equivalent to shouting and this will discourage people answering your question.

Do you know the Pythagoras' Theorem? Plot your points on graph paper and draw two lines, one vertical and one horizontal so that the two points. The distance is then the diagonal linking the two points and is found using the Pythagoras' Theorem.

What do you get?

The x and y difference of the points are 3 and 4, does that seem familiar?
+, don't USE CAPS!!