Question

question 7
which statement about vertical lines is true?
vertical lines have a slope of zero and all of the x - coordinates are the same.
vertical lines have an undefined slope and all of the x - coordinates are the same.
vertical lines have an undefined slope and all of the y - coordinates are the same.
vertical lines have a slope of zero and all of the y - coordinates are the same.

Explanation:

Vertical lines run straight up and down. The slope formula is $\frac{y_2-y_1}{x_2-x_1}$; for vertical lines, $x_2=x_1$, so the denominator is 0, making the slope undefined. All points on a vertical line share the same x-coordinate, while y-coordinates vary.

Answer:

Vertical lines have an undefined slope and all of the x-coordinates are the same.