given points A（2.-1）.B(3.5),find

given points A（2.-1）.B(3.5),find
a.the slope
b.interpret the value of the slope
c.the equation of the line passing through the given points
d.the equeation of the vertical line through the given point b
e.the equation of the horizontal line through the given point B.
f.the equation of theline passing through C（-7,4）and parallel to the line AB.
g.the equation of the line passing through D(0,5) and perpendicular to the line AB