Question 73996
WITH A S;OPE(m) OF 3 AND PASSING THROUGH (3,1) WE NEED TO FIND THE Y INTERCEPT.
THUS WE SUBSTITUTE 3 FOR m AND THE POINTS (3,1 ) FOR X & Y VALUES RESPECTIVELY:
1=3*3+b 
b=1-9
b=-8
THUS THE LINE FORMULA IS:
Y=3X-8
{{{ graph( 300, 200, -6, 5, -10, 10, y = 3x -8) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 3x -8).