In the previous module 201, we worked only with numbers. However, operations with variables can be performed just as easily. Note that the remarkable in these expression are unknowns and are dealt with purely symbolically. In a sense, the variables become constants because Maple will remember their values from that point on. Any expressions including these values will be computed numerically.
Variable names can be more descriptive of the values they represent.
However they must begin with a character and must not include any blanks spaces within the name. Be careful, Maple is case sensitive. Maple makes a distinction between upper and lower case. Be careful not to hit the shift key accidentally. Rate and rate are treated as two different variables.