Question

.Write the equation of the vertical line passing through the point (3, 1).

Answer 1

"The equation of the vertical line passing through the point (3,1)"

x = 3 is the equation of the vertical line through the point (3,1)

A vertical line will start off "x = " and then be the x-coordinateon the other side of the equal sign.

A horizontal line will start off "y = " and then be the y-coordinate
on the other side of the equal sign

Answer 2

Notice the coordinates of other points on the vertical line that passes through
point (3, 1). What do all points have in common? All the points have an x-coordinate of 3. That means, no matter what y is, x is always 3. It's as if y makes no difference in the equation of the line. In fact, y makes so little difference, it is not needed. The equation is: x = 3.