Algebra-1

The slope of a line is given by the change in  divided by the change in  (). A line has an undefined slope when the change in  () between any two points on the line is , which occurs for vertical lines.

 

Let's analyze each equation:

A.Equation

The equation  represents a vertical line. For every point on this line, the -coordinate is always , and the -coordinate can take any value. Since the change in  between any two points on this line is , the slope  is undefined.

 

B.Equation

The equation  represents a horizontal line. For every point on this line, the -coordinate is always , and the

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