what is the slope of the line that passes the points (3,1) (2, 4) make sure to identify x1, x2, y1, and y2

At a kentucky friend chicken, a survey showed 2/3 of all people preferred skinless chicken over the regular chicken. if 2,400 people responded to the survey, how many people preferred regular chicken?

See attachment below and find the equivalent of tan(∠qsr)

I’m really confused and need your assist me with this question i’ve never been taught