Source: Algebra Tiles, 26 Design
Now that you know how to use the applet to solve equations, think of this system of equations.
2x – 2y = -1
x + 2y = 7
You can set it up on the website like this. The first equation is shown on top using two blue rectangles.
Source: Algebra Tiles, 26 Design
Notice that the red triangles will zero out with the blue triangles. Move all triangles up to add them together.
Source: Algebra Tiles, 26 Design
Click Zero Out to simplify model.
Source: Algebra Tiles, 26 Design
Divide each side by 3 and you will see that x = 2.
Now solve this problem on the interactive website.
