The variables x and y vary directly. Use the given values to write an equation that relates x and y. x = 18 y = 6

For this case it is observed that the ordered pair is (18,6)
 An equation to relate both variables is
 y = (1/3) x
 In this case we find that the equation can be a line of slope
 m = (1/3)
 Note that:
 y = (1/3)(18)
 y=6