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Direct variation.
In that case, one quantity (the quantity that depends on the other) is said to be a function of the other quantity.
A math expression is a symbol or combination of symbols that represents a quantity or a relationship between quantities.
A direct variation is a situation in which two quantities -- such as hours and pay, or distance and time -- increase or decrease at the same rate. The ratio between the quantities is constant; that is, as one quantity doubles, the other quantity also doubles. so yes it is. -add on- A direct variation is in the form y=ax where a is an constant.
To visually see the relationship between quantities such that one of them can vary independently and the other varies by some amount (or factor) dependent on the independent quantity.