This is a systematic way of telling you to find the slope
The slope = (y2 - y1)/(x2-x1)
y2 = 16, y1 = 19, x2 = 2 and x1 =9
The slope = ( 16 - 19)/(2 - 9)
The slope = (-3)/(-7)
The slope = 0.428571428
so in decimal form the cordinates can be written as 0.428571428
slope is the steepness of a line, it is the difference between the y cordinate divided by the difference in x cordinates