Chapter 1.1, Problem 21E

Find an equation of a line that is perpendicular to the line y=1 that contains the point (5,1) . Write the equation in slopeintercept form.

Find an equation of a line parallel to the line y=3x+1 that contains the point (4,2) . Write the equation in slopeintercept form.

Find the equation of the line perpendicular to the line y=3 and passing through the midpoint of the segment joining 2, 4 and -6, 10.