Wires

The wires in a model connect blocks together to define equations. For example, to write an equation for 100/33, you would place a on the canvas, and give it the value of 100:

Then do the same for 33, and place a divide block on the canvas:

Then click on the right hand edge of and drag to extend the wire to the numerator ($\times$) port of the divide operation.

Finally, add the other wire.