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?

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 = 2and this cannot be written in y = mx + b form because it has an undefined slope.

Hope i can you!

4should be the last one n=4