This question is not very clearly phrased, but one possible answer is "discontinuous".
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The factors which you change (vary) are called variables.
they are called variables
A tentative descriptive statement of the relationship between the variables is called hypothesis
the gap between two parts which have to be welded called root gap
An equation with two variables . . . seriously!An equation with one variable can be can be solved, but when there are two variables, you need two equations. This is called a system of two equations in two variables.Three equations in three variables, etc.