Algebra-1

The slope of a line is calculated as the change in  divided by the change in  (). A line has an undefined slope when the denominator of the slope formula () is equal to . This occurs when the line is vertical.

Let's analyze each of the given equations:

A.Equation

This equation is in the slope-intercept form , where  is the slope and  is the -intercept. Here, the slope , so this line does not have an undefined slope.

B.Equation

The equation  represents a vertical line. For every point on this line, the -coordinate is always , while the -coordinate can take any value. Since for a vertical line, the change in

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