Question 54878
write an equation in slope intercept form for the line that satisfies each set of conditions.
passes through (7,1) and (7,8)
This is a trick question, because you can't wriet this equation in slope intercept form.  It's slope is undefined and it doesn't have a y-intercept.
The formula for slope when given two points is: {{{highlight(m=(y2-y1)/(x1-x2))}}} 
your (x1,y1)=(7,1)  and your (x2,y2)=(7,8)
{{{m=(8-1)/(7-7)}}}
{{{m=7/0}}} When 0 is the denominator of a fraction, the fraction is undefined.
Lines with undefined slopes are special cases, they are vertical lines.
The equation of a vertical line going through those two points is:{{{highlight(x=7)}}}
Happy Calculating!!!