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The coordinates of point a are 30 units of x and 70 units of y. the coordinates of point b are 28 units of x and 76 units of y. with x on the horizontal axis and y on the vertical axis, the slope of the line between points a and b is

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carlosego
The first thing you should know is that the slope of the line that passes through two points, by definition is given by:
 m = (y2-y1) / (x2-x1)
 Substituting the values we have:
 m = (76-70) / (28-30)
 m = -3
 answer:
 the slope of the line between points a and b is
 m = -3