Find the slope of the line through each pair of points:
1. (19,-3), (-14, 4)
2. (17, 10), (14, -19)
3. (10, 15), (-17, 30)
4. (0, -3), (-5, -16)

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for