Evaluate the function t(x) = 19-x, when x=-3

Triangle xyz has vertices x(1,3), y(0,0)

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 graph: .

Find the equation using the point (4,8)