\[\frac{a}{b} = \frac{\text{antecedent}}{\text{consequent}} \equiv \frac{\text{numerator}}{\text{denominator}}\]

We are dividing \(a\) into equal parts \(b\). So \(b\) is the unit that defines the scale.

1. x-y coordinates make up a ratio, right?
   
2. Straight line is contstant ratio or x/y = constant
   
3. What about functions? Are they continuous ratios?
   
4. What happens when we have 3 axes, x, y, z?
   
5. Then we have, x/y, x/z, y/z, and also inverse of these.