How do u plot the points from the equation y=-2x+1 and y=3x-1

Aportion of a line bounded by two points is defined as

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

The given dot plot represents the average daily temperatures, in degrees fahrenheit, recorded in a town during the first 15 days of september. if the dot plot is converted to a box plot, the first quartile would be drawn at __ , and the third quartile would be drawn at link to the chart is here