Answer:
Vertical lines have undefined slopes.
Step-by-step explanation:
Lines that have equal slopes are parallel lines, and not vertical lines.
Vertical lines are symbolically represented by the equation, x = a where a is the x-intercept. Vertical lines also have an undefined slope--its slope does not run horizontally, as all points on the line have the same x-coordinate.
Since any two points on a vertical line have the same x-coordinate, the slope cannot be computed as a finite number, as you normally would in using the slope formula, m = (y2 - y1)/(x2 - x1). because division by zero is an undefined operation.
You cannot say that two vertical lines have equal slopes, because the slopes of vertical lines are undefined.
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