Question 427399
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Hi
Using the point-slope formula, {{{m =(y[2] - y[1])/(x[2] - x[1])}}}
(4, 2) and 
(5, -2)   m = 4/-1 = -4
 Always important to watch the signs.
Line  y = -4x  for example slants to the left
Line  y = 4x slants to the right
{{{drawing(300,300,   -6, 6, -6, 6,   grid(1),
graph( 300, 300, -6, 6, -6, 6,0,4x,-4x))}}}