Question

What slope do you use when your trying to find the orthocenter of a triangle and the slope is 7/0?

Answer 1

First I think you are supposed to take two points and find the slope
of one line beween two points, then invert to find the slope of a
perpendicular. You put the points and slope into a Y = mx+B form and
find the intercept, then put the line into an x+y = constant form.
Repeat for another vertex. Once you have 2 equations, cancel out the
X to find the Y, then cancel out the Y to find the X. That point (X,Y)
should be the intersection of the altitudes.