What is the equation of the line that passes through the point(1,7) and has a slope of -1

How is the number of vertices for a prism related to the name of the prism

We just started the introduction into circles and i have no idea how to do this.

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3