Question 425946
{{{drawing(500,500,-10,10,-10,10,grid(1),circle(-7,2,0.3),circle(9,6,0.3),graph(500,500,-10,10,-10,10,y=x/4 + 15/4))}}}

From (9,6) draw a line 2 units vertically downwards.
then from this point , draw a horizontal line to meet the the line at (1,4) .
measure y = 2 units
measure x = 8 units
y/x = 2/8 = 1/4 = slope

since the line is rising towards the right the slope is positive.
so slope = +1/4