Line ab contains points a(1,2) and b(-2,6).the slope of line ab is

a) zero

b) undifined

c) positive

d) negative

(1,2)(-2,6)
slope = (6 - 2) / (-2 - 1) = -4/3slope is negative

little tip *** if u have 2 sets of points, and the x's are the same, u have vertical lines with a slope undefined. If u have 2 sets of points, and the y's are the same, u have horizontal lines with a slope of 0. Otherwise, u use the slope formula : (y2 - y1) / (x2 - x1) and see if the slope is + or -