A negative temperature coefficient indicates that the dependent variable, the variable of interest increases when the temperature decreases and conversely. This could, for example, be the density of an object (excluding water at 0 - 4 deg C). As the temperature goes up the volume increases so the density decreases.
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5x 5 is the coefficient and x is the variable.
No, it is a fundamental mechanical property of the material
negative numbers> temperature.
In the equation 2x = 6 the coefficent of x is 2
no because the only way degrees can be negative is in temperature.