p = k/v
or
pv = k
k is a constant
p is pressure
v is volume
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A formula is an equation that expresses a relationship between measurements.
type the equation that shows the relationship between the variables in this chart.
A function.
The difference between these two is that an expression only contains variables, numbers, and mathematical symbols, and an equation contains two expression with an equal sign that separate them. For example, while an expression is "2x-1", an equation is "2x-1 = 5x."
nCr = nPr/r!