then reload this page.
The coordinates of a point give us directions so that we can locate it on a
coordinate plane. In this lesson you will learn to describe points in
the plane and study the different parts of the coordinate plane.
A point has coordinates $(x, y)$, where
$x$ is given by the labels below the coordinate grid, and $y$ is given
by the labels to the left of the coordinate grid.
Sometimes we want to name several variables in a way that shows they are related. When we
do, we’ll write a variable with a subscripted number. For example, $x_1$ (pronounced
“$x$-1” or “$x$-sub-1”) is a variable which is related to (but different from) the variable
Use the slider to the left to change the value of $x_1$ for the
point $(x_1,2)$. Notice how the
Use the slider to change the value of $y_1$ and notice how the
point $(2,y_1)$ moves.
Use the $x_1$ slider to change the $x$-coordinate of the
point $(x_1,y_1)$. Use the $y_1$ slider to
change the $y$-coordinate of the point. Notice how the
point moves. The coordinates of the point are
shown below the grid.