What is the slope of the line determined by the points (-1,3) and (3,-1)?

slope = (y2-y1)/(x2-x1)

  = (-1-3)/(3--1)

=(-4)/(3+1)

=-4/4

=-1

Slope is -1

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.