Above we have a triangle graphed on a coordinate plane. Its three points (x, y) are displayed in a vertex matrix.
Matrix addition and subtraction can be used to translate a figure. To translate a figure is to move it without changing its size or shape.
Let's move triangle ABC two units to the left, and two units down.
First, we subtract "2" from each x value in the matrix.
Next, we subtract "2" from each y value in the matrix.
Now, we've translated the triangle: