Question 49199
If the two points (0, 4) and (1.5, 0) lie on the line, you can find the slope, m, of this line by the formula:
{{{m = (y2-y1)/(x2-x1)}}}

Where: (x1, y1) = (0, 4) and (x2, y2) = (1.5, 0) Make the appropriate substitutions and solve for m.

{{{m = (0-4)/(1.5-0)}}}
{{{m = -4/1.5}}}
{{{m = -8/3}}}