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In mathematics, many situations are described by how two variables change together.
A proportional relationship is a particularly useful type of relationship because it has a simple algebraic form, a recognizable graph, and predictable scaling.
In a relationship, one variable is often the independent variable (the input you choose or control) and the other is the dependent variable (the output that changes as a result).
If the price of fuel depends on how many liters you buy, then liters is the independent variable and price is the dependent variable.
Proportionality constant
A non-zero constant, usually called $k$, that links two proportional variables (also called the constant of variation).
There are three equivalent ways to identify direct proportion.
Most direct proportion questions follow the same method.
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