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The equations
x = 4t and y = 2 - 10t - 5t^2
can represent the path of a projectile. They are called parametric equations and t is the parameter.
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Glossary

parametric equations

a pair of equations x=u(t) and y=v(t) where t is a parameter, that describe a curve.

path

A finite sequence of edges such that the end vertex of one edge in the sequence is the start vertex of the next and in which no vertex appears more than once.

Full Glossary List