Equivalent fractions are fractions that have the same value as another fraction.
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The noun forms for the verb to define are difinability, definement, and the gerund, defining. Another noun form is definition.
Depends how you define it. For a particular problem, you can arbitrarily define one direction as positive, in this case, the other direction is negative.
define
Two coordinates define a point. You need two pairs of two coordinates to define two points and, therefore, a slope.
All of the points on a parabola define a parabola. However, the vertex is the point in which the y value is only used for one point on the parabola.