Question 921167
P1 (0,0), 
P2(4, -3) m ={{{(y[1] - y[2])/(x[1] - x[2] )}}} = 3/-4 = -3/4
***Using point-slope form, {{{y - y[1] = m(x - x[1])}}}P(0,0)
y - 0 = (-3/4)(x-0)
y = (-3/4)x
(2,-1) on this line.  Plot Points and connect with line
{{{drawing(300,300,   -6, 6, -6, 6, grid(1), 
circle(0, 0,0.3),
circle(4,-3,0.3),
circle(0,0,0.2),
circle(0,0,0.2),
graph( 300, 300, -6, 6, -6, 6,0,-.75x) )}}}