Stephanos T. answered 04/27/20
Experienced Mathematics Tutor With a Bachelors in Mathematics
Remember that slope=Δy/Δx=(y2-y1)/(x2-x1)
Our points are (7,-4) and (7,0)
You can stat at either point but stay consistent!
So slope=[0-(-4)]/[7-7]=4/0=undefined
We know this is the vertical line of x=7 and vertical lines have undefined (or infinite) slope
Hope this helped!