Question 627931
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
show that the points (6,7)(2,3)(4,5) lie on a straight line:
examining slopes {{{m =(y[2] - y[1])/(x[2] - x[1])}}}
(6,7)
(2,3)  m = 4/4 = 1
(4,5)  m = -2/-2 = 1
by plotting points:
{{{drawing(300,300,   -6, 7, -6, 10,  grid(1),
circle(6,7,0.3),
circle(2,3,0.3),
circle(4,5,0.3),
graph( 300, 300, -6, 7, -6, 10,0,x+1))}}}