Question 852187
Slope is change in y over change in x. 
So for a slope of 1/2, for two units change in x, make one unit change in y.
(3,-4) + (2,1)=(5,-3)
(5,-3) + (2,1)=(7,-2)
(7,-2) + (2,1)=(9,-1)
(9,-1) + (2,1)=(11,0)
You can plot the points and draw the line that contains all the points. 
{{{drawing(300,300,-2,12,-6,6,grid(1),
circle(3,-4,0.2),
circle(5,-3,0.2),
circle(7,-2,0.2),
circle(9,-1,0.2),
circle(11,0,0.2),
graph(300,300,-2,12,-6,6,(1/2)(x-3)-4))}}}