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Constant of Variation
When x and y are variables you can write k=y/x so the ratio y:x equals the constant k
A linear function defined by an equation of the form y=kx where k=/ 0; as with any line the slope k is constant
A relation in which each element of the domain is paired with exactly one element in the range
an inequality in teo variables whose graph is a region of the coordinate plane that is bounded by a line
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