Question

How do I find the parallel slope from one ordered pair? For example, my question is "A line parallel to the y-axis passes through the point (2,7). What is the equation of this line?

Answer 1

the y axis is a vertical line. A vertical line has a slope that is undefined. A vertical line is also represented by x = a number...with that number being the x coordinate of ur point (2,7).
therefore, ur equation is : x = 2.....and this cannot be written in y = mx + b form because it has an undefined slope.