Question 208238
(4, -1) and (2, -7).  
Y=mX+b
m=(Y2-Y1)/(X2-X1)=(-7+1)/(2-4)=-6/-2=3 FOR THE SLOPE.
-1=3*4+b
-1=12+b
b=-12-1
b=-13 ANS. FOR THE Y INTERCEPT.
Y=3X-13 is the line formula.
{{{ graph( 300, 200, -6, 5, -15, 10, 3x -13) }}} (graph 300x200 pixels, x from -6 to 5, y from -15 to 10, 3x -13).