Which of the following statements is NOT correct about a linear function? A. The equation \( \frac{y}{8}=x \) is an example of a linear function. B. A linear function can be represented by an equation \( y=m x+b \). C. The graph of a linear function is a straight line. D. The equation \( \frac{y}{7}=x^{2} \) is an example of a linear function.

The statement that is NOT correct about a linear function is: D. The equation \( \frac{y}{7}=x^{2} \) is an example of a linear function. This equation represents a quadratic function because of the \( x^{2} \) term, resulting in a parabolic graph rather than a straight line. Linear functions are great for modeling real-world scenarios! For instance, if you’re trying to determine the total cost of a certain number of items at a fixed price each, the relationship can be described with a linear equation like \( y = mx + b \), where \( m \) is the price per item and \( b \) is any fixed fees. This simplistic view helps businesses and individuals forecast expenses easily!