ummm. that is a very good question but unfortunately and fortunately , i have the answer.
you could use variables and examples.
You can represent values using variables. This can only be done with whole numbers.
When two variables are related in such a way that the ratio of their values always remains the same, the two variables are said to be in direct variation. y=2x is direct variation y=x+2 is not direct variation
No, they do not. Although it is using letters to represent numbers, Roman numbers are fixed symbols, unlike letters in algebra which represent variables.
To represent values
Models may not take into account all of the variables.
A literal equation is an equation where variables represent known values. Literal equations allow us to represent things such as distance, time and interest as variables in the equation.. Using variables instead of words is a 'time saver'. For example d=rt. Meaning distance = rate and time
The letters at the end of the alphabet usually represent variables while the letters at the beginning of the alphabet usually represent constants. As you get into more and more difficult mathematics, those are not sufficient. Then you need to start using Greek, then Hebrew, then Old German, and finally Russian.
A and b are the variables cause they represent a number
The constant.
A single statement, using variables, can convey the same information as many, sometimes infinitely many, statements.
The inverse variation is the indirect relationship between two variables. The form of the inverse variation is xy = k where k is any real constant.
It can represent formulas like A=L×W etc...